Is there a iOS player app that display composer id3 info and play Apple Music songs?
You can try MyAudioStream audio application for iPhone and iPod. A nice music player and audio streamer to playback or beam music that you have stored on PC, MAC any UPnP/DLNA server wirelessly and transfer to any wireless speakers, AV receivers. I have at home PC with Serviio installed, like a server and stream the songs to my device from there wirelessly.