IOS – iOS player app that display composer id3 info and play Apple Music songs

If you're willing to sacrifice Siri for the ability to control your music with your voice, you could turn off Siri in Settings>General>Siri, which'll make your iPod respond to a held-down Home button with the classic Voice Control interface instead. A Google search is telling me that that one works offline!

For more information about non-Siri Voice Control, check out Apple's support page. Here's what it says about music playback:

• You can play all songs in an album, playlist, or by an artist. The device won't recognize commands to play a particular song.

• If you can't get the device to recognize the album or artist name, try telling it to play a playlist.

• If an artist has "The" in the name, say it.

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