On top of using their main application (DAW), which is most likely 64-bit, musicians tend to use a ton of plug-ins; some commercial, some freeware. Many if not

On top of using their main application (DAW), which is most likely 64-bit, musicians tend to use a ton of plug-ins; some commercial, some freeware. Many if not most are 32-bit only and probably will never be updated (abandonware, or just old unsupported releases from commercial vendors). Basically for many musicians, upgrading macOS will mean killing some of their plugins.