It is a shame that when you buy an album from iTunes, lyrics are not part each and every track. Thankfully, there’s a tweak for that!
If you go to Cydia on your jailbroken device, you will see that Big Boss has a tweak called Lyricalizer.
Lyricalizer is available for $1.29 and adds the lyrics to the song you are listening on the music app of your iPad.
Very useful for people who like to know the lyrics to a song, or to sing along.