What's that coming over the hill? Is it a concept?

So here's the concept. Ever tried writing a song? It can be quite a painful experience. You're walking down the street humming when suddenly an idea drops into your head. You rush home, grab your guitar, strum some rough chords and write down a couple of lines. You can kinda hear what it should sound like, but you can't think of a good rhyme for life (wife, knife, strife...) and as the song slowly progresses, you forget the rhythm for the first bit. Soon the best bit of the song (your original idea) is forgotten amidst a see of scribbles and all you can think of is the annoying bit that you don't like.

The concept is a piece of software to ease the pain of writing songs. It'll allow you to stick down chords and words really easily as they come to you and play the whole thing back. I'm hoping to put a rhyming dictionary in for those difficult lines, and you'll be able to generate some great sounding accompaniments. In the space of half an hour, you'll have a completed song that you can print out (in lots of different forms (music score, guitar tab, just words etc...,) and burn to CD. That means that when you turn up at the band rehearsal, you won't spend an hour trying to explain how you imagined it would sound - you can show them. You could even email them an mp3 of the music before the rehearsal!

It all sounds great in theory but there are a few products on the market which do similar things. Market research here I come!