Hello burdickdave,
To confirm, are you having issues with songs missing from your library? If so, and the songs were added from Apple Music, it's possible the song was removed from the Apple Music catalog. This information can be found in the following article, along with additional information that may help with reaching a resolution.
If songs are missing from your music library after you turn on Sync Library
If the song is from another source such as a CD, it's possible that Sync Library may not be enabled. You can enable Sync Library on your iPhone via the steps below. You can find the steps for enabling Sync Library on other devices via the article below.
- "Make sure that your iPhone or iPad is signed in with the same Apple ID that you use with your Apple Music subscription.
- Go to Settings.
- Tap Music.
- Turn on Sync Library.
- Turn on Sync Library on your other devices."
Use Sync Library to access your music library across your devices
Take care!