If you've got a little music creation experience and you're looking for the current hot tickets for computer generated music the two programs you really need to look at are Reason and Abelton Live.
Reason is an incredible loop generator, but the learning curve is henious. I mean brutal. I've been using it for four years and I still only understand about ten percent of it. It is however a massively powerful piece of kit and has incredbly cool synths buit in. There is very little you can't do with it, providing you put the time in to it. (It also helps if you've patched up countless real world recording studios, because the softaware simulates the units you've find there, right down to the cabling.
Abelton Live is the best, most intuitive piece of music software I've ever seen and the built in tutorials are an absolute dream. A friend gave me five minutes of introduction and I was producing very cool music two minutes later, all in a completely professional environment.
Now, to be fair I've a lot of recording studio experience and I've used audio sequencing software for years, so I wasn't exactly a novice. However, I'd still recommend it to anyone.
The two pieces of kit together should allow a reasonably creative person to produce almost anything they can imagine and quite a lot of things they can't.
However, if you're not looking to get into the hard stuff, you might want to combine Fruity Loops with Abelton Live, which I think would be a great place to start.
