High-quality music files can take up a lot of space. If your iMac storage is getting full, consider keeping your downloaded library on an external SSD and pointing the Music app to that folder in Settings > Files .
If you have a collection of physical CDs and an external USB disc drive, you can "rip" them into your iMac: Insert the CD into the drive. Open the app. Click Import CD in the top right corner. How To Free Music On Imac
Several major platforms offer free, ad-supported tiers that work perfectly in Safari or Chrome on your iMac: High-quality music files can take up a lot of space