Apples music app in iOS 11 makes it difficult to view custom lyrics, and impossible to see custom artwork for each song (not album art) at a reasonable scale.
Lyric Viewer lets you browse through all songs in your iTunes library which contain custom lyrics, grouped by album. Play each song, and view its lyrics and optional custom artwork at any scale.
Add timing information to the songs Comments field in iTunes, and jump directly to up to six playback positions in each song.
No music tracks are included with the app.