I used to have a playlist called "speed lyrics"
(not sure what happened to it)

BNL's One Week has a lot of lyrics, but it's not as fast as some others.

Bree Sharp's Guttermouth and Weird Al's You Make Me are pretty fast ones.

But the fastest lyrics I can find in my collection (~14K songs) is from the Animaniacs sountrack (the first one) called Yakko's World. In 1:35, he runs through almost all the countries of the world!

So how about combining a bunch of apps together:
Have GPSapp detect where you are and play certain songs that may be more appropriate to that setting. Using a serial connection to an OBD-II link, the player could automatically show lyrics when you're stopped. After a song had been played a certain number of times, emptriv could quiz you on song lyrics using the TTS engine to read questions. Of course all of these apps would be installed by the future jEmplode's auto-installer and run via preinit. Then there's Hijack as the glue that holds all the apps together.