Apple Music
I have signed up for an Apple Music three month trial but it’s not letting me download music for free like it previ was.
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Make sure Settings﹥Music﹥Show Apple Music and ﹥iCloud Music Library are turned on, for full Apple Music functionality on your iOS device.
Then use the tabs within the Music app to get your music. Don’t use the iTunes Store app for that, as that is separate from the Apple Music subscription.
You would first add music to your library, then use the download-from-the-cloud symbol 
next to the tracks in the library to download tracks to your device.
Add and download music and video content from the Apple Music catalog - Apple Support