Most Android applications don't take advantage of the extra screen space on tablets, but not Apple Music. The latest beta release, version 2.7, officially adds support for Android tablets — among other improvements.
Here's the changelog from the Play Store:
• Tablet Support — enjoy Apple Music with an experience designed for a wider range of Android devices
• Performance improvements for images and audio playback
• Various bug fixes
Here's a screenshot of the new interface, courtesy of Pixel Spot: