New setting in Settings → Library → File Organization: "Collaborative
Album Artist" — choose between first listed artist (default) or all
artists combined for $albumartist in folder paths and album_artist tag.
Per-source resolution:
- Spotify: artists array has separate objects — picks first directly
- Deezer: API already returns first artist only — no change needed
- iTunes: combined string ("Larry June, Curren$y & The Alchemist") —
resolves via artistId API lookup to get primary name ("Larry June").
Safe for "Tyler, the Creator" and "Simon & Garfunkel" because their
IDs resolve to the same combined name (no change).
Applied to both folder path ($albumartist template) and album_artist
metadata tag for consistency. Track artist tag always keeps all artists.
iTunes lookup only fires when source is iTunes (numeric ID + not Deezer).
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