IOS – Offline music not showing up after iOS 9.2 upgrade

Easiest solution I have found so far is to disable the iCloud Music Library and open the Music app so that it can delete the cached files and/or release that storage to iOS to clear when needed.

Details: This solution is an adaptation of solutions I found for the same issue with iTunes Match. The clearing and rebuilding of your music library takes time, so I hope Apple adds a simple "clear Music cache" button to the settings in the future.

1. Settings>Music: Turn off iCloud Music Library
2. Open Music app: Your library should start to clear
3. Settings>Music: Turn on iCloud Music Library
4. Open Music app: Your library will be rebuilt

The process preserved my offline copies of songs previously synced to my iPhone prior to switching to the iCloud Music Library. I am not sure if it preserves offline Apple Music copies.

Found the answer! This feature is invisible and you have to know it's there.

To shuffle songs within a genre in your library, do the following:

1. Tap the "My Music" tab.

2. Tap the selection in the divider at the top between "Recently Added" and the music list. A drop down will appear where you can select a means to sort. Select "Genre". You can use this same method to shuffle within other sorting schemes (artists, albums, etc.)

3. Scroll to your desired Genre. Tap the IMAGE (or gray square) to the left of the Genre name, not the name itself. A song within that genre should start to play.

4. When you tap the currently playing song name at the bottom, the currently playing song will expand up. Make sure the Shuffle icon is lit at the bottom.

5. THAT'S IT! Enjoy! If you have the "repeat" icon de-selected, playback will stop once all the songs in the selected genre have been played.

Source (apple forum): https://discussions.apple.com/thread/7106074?tstart=0