diff --git a/backend/app/routers/songs.py b/backend/app/routers/songs.py
index d30607f..aacee58 100644
--- a/backend/app/routers/songs.py
+++ b/backend/app/routers/songs.py
@@ -30,18 +30,16 @@ def _song_out(s: Song) -> dict:
 
 
 @router.get("/today")
-async def today_songs(league: str = "kbo", db: AsyncSession = Depends(get_db)) -> list[dict]:
+async def today_songs(league: str = "", db: AsyncSession = Depends(get_db)) -> list[dict]:
+    """오늘의 응원가 목록 — league 미지정 시 전 리그(kbo+mlb)."""
     today = datetime.now(KST).date()
     # 업그레이드(라인업 반영 재생성) 중인 곡도 이전 트랙을 계속 서빙 — 재생 공백 없음
+    conds = [Song.date_kst == today, Song.status.in_(("complete", "generating"))]
+    if league:
+        conds.append(Song.league == league)
     rows = (
         await db.execute(
-            select(Song)
-            .where(
-                Song.league == league,
-                Song.date_kst == today,
-                Song.status.in_(("complete", "generating")),
-            )
-            .order_by(Song.match_id, Song.team_code)
+            select(Song).where(*conds).order_by(Song.match_id, Song.team_code)
         )
     ).scalars().all()
     return [_song_out(s) for s in rows if s.tracks]
diff --git a/backend/app/services/songs.py b/backend/app/services/songs.py
index 7bfc17f..1a04f46 100644
--- a/backend/app/services/songs.py
+++ b/backend/app/services/songs.py
@@ -169,10 +169,14 @@ async def _series_line(db, m: Match) -> str | None:
 
 
 async def fetch_lineups(m: Match) -> dict | None:
-    """네이버 preview 에서 오늘 선발 라인업 조회 (발표 전이면 announced=False).
+    """오늘 선발 라인업 조회 (발표 전이면 announced=False). KBO=네이버, MLB=공식 API."""
+    if m.league == "mlb":
+        return await _fetch_lineups_mlb(m)
+    return await _fetch_lineups_kbo(m)
 
-    fullLineUp 은 발표 전엔 선발투수 1명만 담긴다 — 양팀 타자 8명 이상이면 발표로 간주.
-    """
+
+async def _fetch_lineups_kbo(m: Match) -> dict | None:
+    """네이버 preview fullLineUp — 발표 전엔 선발투수 1명만. 양팀 타자 8명 이상 = 발표."""
     import httpx
 
     from .baseball_details import UA, naver_game_id_candidates
@@ -208,6 +212,69 @@ async def fetch_lineups(m: Match) -> dict | None:
     return None
 
 
+async def _fetch_lineups_mlb(m: Match) -> dict | None:
+    """MLB 공식 Stats API — schedule 로 gamePk 해석 후 boxscore battingOrder.
+
+    battingOrder 는 라인업 발표 전엔 빈 배열. 양팀 9명 이상 = 발표.
+    """
+    import httpx
+
+    from datetime import datetime
+
+    from ..teams_baseball import MLB_ID_TO_CODE
+    from .baseball_sync import match_seq
+
+    kick = ensure_aware(m.kickoff_at)
+    date_kst = kick.astimezone(KST).strftime("%Y%m%d")
+    start = (kick - timedelta(days=1)).date().isoformat()
+    end = kick.date().isoformat()
+    async with httpx.AsyncClient(timeout=15) as c:
+        r = await c.get(
+            f"{settings.mlb_api_base}/v1/schedule?sportId=1"
+            f"&startDate={start}&endDate={end}"
+        )
+        r.raise_for_status()
+        cands: list[tuple[str, int]] = []
+        for day in r.json().get("dates") or []:
+            for g in day.get("games") or []:
+                a = MLB_ID_TO_CODE.get((g["teams"]["away"]["team"] or {}).get("id"))
+                b = MLB_ID_TO_CODE.get((g["teams"]["home"]["team"] or {}).get("id"))
+                gd = g.get("gameDate")
+                if not a or not b or not gd:
+                    continue
+                g_kst = (
+                    datetime.fromisoformat(gd.replace("Z", "+00:00"))
+                    .astimezone(KST).strftime("%Y%m%d")
+                )
+                if a == m.team_a_code and b == m.team_b_code and g_kst == date_kst:
+                    cands.append((gd, g.get("gamePk")))
+        cands.sort()
+        idx = match_seq(m.match_id) - 1
+        pk = cands[idx][1] if idx < len(cands) else None
+        if not pk:
+            return None
+        r2 = await c.get(f"{settings.mlb_api_base}/v1/game/{pk}/boxscore")
+        r2.raise_for_status()
+        teams = r2.json().get("teams") or {}
+
+    def batters(side_key: str) -> list[dict]:
+        t = teams.get(side_key) or {}
+        players = t.get("players") or {}
+        out = []
+        for pid in t.get("battingOrder") or []:
+            p = players.get(f"ID{pid}") or {}
+            name = (p.get("person") or {}).get("fullName")
+            if name:
+                out.append({
+                    "playerName": name,
+                    "positionName": (p.get("position") or {}).get("abbreviation", ""),
+                })
+        return out
+
+    away, home = batters("away"), batters("home")
+    return {"away": away, "home": home, "announced": len(away) >= 9 and len(home) >= 9}
+
+
 def _lineup_line(lineups: dict | None, side: str) -> str | None:
     if not lineups or not lineups.get("announced"):
         return None
@@ -268,10 +335,16 @@ async def build_context(
 
 
 # ── LLM 작사 ───────────────────────────────────────────────────
-def _lyrics_prompt(team_name: str, context: str) -> str:
+_LEAGUE_LABEL = {"kbo": "한국 프로야구(KBO)", "mlb": "메이저리그(MLB)"}
+
+
+def _lyrics_prompt(team_name: str, context: str, league: str = "kbo") -> str:
     return (
-        "너는 한국 프로야구 응원가 전문 작사가다. 아래 오늘 경기 정보를 바탕으로 "
-        f"'{team_name}'의 **오늘의 응원가**를 만들어라.\n\n"
+        f"너는 {_LEAGUE_LABEL.get(league, '프로야구')} 응원가 전문 작사가다. "
+        "아래 오늘 경기 정보를 바탕으로 "
+        f"'{team_name}'의 **오늘의 응원가**를 한국어로 만들어라"
+        + (" (팀명·선수명은 한국 팬에게 익숙한 표기로)" if league == "mlb" else "")
+        + ".\n\n"
         f"[오늘 경기 정보]\n{context}\n\n"
         "[요구사항]\n"
         "- 야구장에서 수만 관중이 떼창하는 웅장한 스타디움 앤섬\n"
@@ -295,9 +368,9 @@ def _parse_json(text: str) -> dict:
     return json.loads(m.group(0) if m else t)
 
 
-async def write_lyrics(team_name: str, context: str) -> dict:
+async def write_lyrics(team_name: str, context: str, league: str = "kbo") -> dict:
     """LLM 으로 {title, style, lyrics} 생성 — Claude 우선, GPT 폴백."""
-    prompt = _lyrics_prompt(team_name, context)
+    prompt = _lyrics_prompt(team_name, context, league)
     if settings.anthropic_api_key:
         from anthropic import AsyncAnthropic
 
@@ -326,12 +399,15 @@ async def write_lyrics(team_name: str, context: str) -> dict:
 
 
 # ── 생성 시작 · 폴링 ───────────────────────────────────────────
+SONG_LEAGUES = ("kbo", "mlb")  # 응원가 대상 리그 (MLS 제외)
+
+
+def _song_leagues() -> list[str]:
+    return [l for l in SONG_LEAGUES if l in settings.league_list]
+
+
 def _enabled() -> bool:
-    return bool(
-        settings.songs_enabled
-        and settings.suno_api_key
-        and "kbo" in settings.league_list
-    )
+    return bool(settings.songs_enabled and settings.suno_api_key and _song_leagues())
 
 
 async def _start_one(db, m: Match, side: str, lineups: dict | None) -> bool:
@@ -351,7 +427,7 @@ async def _start_one(db, m: Match, side: str, lineups: dict | None) -> bool:
         if row.status == "complete" and (row.with_lineup or not announced):
             return False
 
-    piece = await write_lyrics(name, context)
+    piece = await write_lyrics(name, context, m.league)
     title = str(piece.get("title") or f"{name} 오늘의 응원가").strip()[:40]
     style = str(piece.get("style") or DEFAULT_STYLE).strip()
     lyrics = str(piece.get("lyrics") or "").strip()
@@ -395,7 +471,7 @@ async def start_due_songs(db, force_today: bool = False) -> int:
     """
     now = now_utc()
     conds = [
-        Match.league == "kbo",
+        Match.league.in_(_song_leagues()),
         Match.result_outcome.is_(None),
         Match.status.notin_(("cancelled", "finished")),
     ]
diff --git a/frontend/src/components/MatchupHUD.tsx b/frontend/src/components/MatchupHUD.tsx
index 03692cf..b08f5c3 100644
--- a/frontend/src/components/MatchupHUD.tsx
+++ b/frontend/src/components/MatchupHUD.tsx
@@ -160,7 +160,7 @@ export default function MatchupHUD({ match, lang = "ko" }: { match: Match; lang?
         <div className="mt-5 grid grid-cols-[1fr_auto_1fr] items-center gap-3">
           <div className="flex flex-col items-center gap-2.5">
             <TeamFlag team={left} className={flagCls} />
-            {match.league === "kbo" && (
+            {isBaseball && (
               <CheerSongButton matchId={match.matchId} teamCode={left.code} lang={lang} />
             )}
           </div>
@@ -183,7 +183,7 @@ export default function MatchupHUD({ match, lang = "ko" }: { match: Match; lang?
           </div>
           <div className="flex flex-col items-center gap-2.5">
             <TeamFlag team={right} className={flagCls} />
-            {match.league === "kbo" && (
+            {isBaseball && (
               <CheerSongButton matchId={match.matchId} teamCode={right.code} lang={lang} />
             )}
           </div>
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
index 0068938..74ca2bc 100644
--- a/frontend/src/lib/api.ts
+++ b/frontend/src/lib/api.ts
@@ -60,8 +60,8 @@ export interface SongOut {
   tracks: SongTrackOut[];
 }
 
-export function getTodaySongs(league = "kbo"): Promise<SongOut[]> {
-  return http<SongOut[]>(`/songs/today?league=${league}`);
+export function getTodaySongs(league = ""): Promise<SongOut[]> {
+  return http<SongOut[]>(`/songs/today${league ? `?league=${league}` : ""}`);
 }
 
 export function listMatches(lang: Lang, league = ""): Promise<Match[]> {
diff --git a/frontend/src/lib/playlist.ts b/frontend/src/lib/playlist.ts
index e80b568..8118321 100644
--- a/frontend/src/lib/playlist.ts
+++ b/frontend/src/lib/playlist.ts
@@ -57,7 +57,7 @@ function fetchSongsCached(): Promise<SongOut[]> {
   const day = todayKstKey();
   if (!songsPromise || songsDay !== day) {
     songsDay = day;
-    songsPromise = getTodaySongs("kbo").catch(() => []);
+    songsPromise = getTodaySongs().catch(() => []); // 전 리그(kbo+mlb)
   }
   return songsPromise;
 }