The app also promises to teach you about "grammer" (though evidently not spelling), metaphors and rhyme schemes, so even if you don't manage to learn how to rap your poetry appreciation skills should get a boost.

If you've come to the conclusion that you have no musical talent and merely want to enjoy a comprehensive and lavishly illustrated history of rock music, then this is the app for you.

For £2.99 you'll be able to read about the origins of rock and its many sub-genres, with YouTube and iTunes links included so you can see or hear the artists in action. It's also optimised for the retina display of the third-generation iPad.