Bringing up Custom Lyrics on your iPhone
Not a question but a comment. I found, quite by accident, that to bring up my custom lyrics on my iPhone SE I just need to TOUCH AND HOLD the song until another window pops up. Lyrics is at the bottom.
If you can't find your lyrics using the "old" method of tapping on the song bar at the bottom of the screen and then tapping on the 3 dots, try this method.
iPhone SE, iOS 11.0.1, 128 GB