Where apps hide your files
iTunes became Music, and the folder moved with the rename. If you are hunting for the actual audio files — to back them up, move them, or just understand what you own — this is the map.
~/Music/Music/Media.localized/Music
Inside, files are filed as Artist/Album/Track.ext. The double Music is real: the first is the app's container folder, the second the media folder. Older machines may still have ~/Music/iTunes/iTunes Media from before the rename.
Music only copies files into its folder if Settings → Files → Copy files to Music Media folder when adding is on. With it off, the library references tracks wherever they were when added — Downloads, old drives, anywhere. That is how libraries end up scattered.
File → Library → Organize Library → Consolidate files copies every referenced track into the media folder, which is the step to take before any backup or move.
~/Music/Music folder to the external drive.copied folder.
The Option-launch library picker is the supported mechanism, and it is also how you maintain separate libraries.
After consolidation, tracks outside the media folder are duplicates or leftovers. Searching the whole disk for audio extensions — .mp3, .m4a, .flac — and excluding the media folder shows what escaped. Spotlight can do this with effort; any tool with a real query syntax makes it one line.
Only if copying into the media folder is enabled, or after consolidating. Otherwise the library still references the original location.
Downloaded streaming tracks are protected files inside the same structure, but they are licences, not files you can back up and keep.
Everywhere keeps track of every file on your Mac — including the folders Spotlight hides and drives you have unplugged. Free for a day, then $19 once.
Download for MacVersion 2.15.7 · macOS 13+ · 3.8 MB · notarised