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So a while back, there was a tweak released for iPad in Cydia called "Lyricalizer" and when installed, downloads the lyrics to your song that you are currently playing if there are no lyrics found.
This tweak has been updated and now works with iPad, iPhone, and iPod touch devices.
Just download the tweak, respring, be connected to wifi and play a song (the song must have the correct name and author for it to work. ie if your song title has "featuring" or "prod"/"produced by" in the title, it more than likely will not work).
Your words will be downloaded and will permanently be shown when you play the song just like you had inserted the lyrics via iTunes.
WARNING
If you start a song and let it play for a few seconds and quickly skip to a different song it may put the words on the wrong song. So when using this tweak and connected to wifi, take your time when going through songs!
Can be found on the Big Boss repo for $1.29