Musixmatch is a widget that integrates with the iOS media player and Notification Center to display the lyrics of the current song you are playing.
How it works: start playing a song in Apple’s Music app, open Notification Center, and Musixmatch will show you synced lyrics that follow as the song plays.
To get started simply install Musixmatch, enable its widget in the Notification Center, and play a song in the Apple Music app. Musixmatch has a large database of officially licensed song lyrics so they are going to be accurate 99.9% of the time. Of course, there will be a song here and there that may not have lyrics attached merely because it just came out or the artist isn’t very well known but for the most part I found almost everyone of my songs had lyrics to go along with it.