Hi Kari. I found this: Hobnox - Audiotool
This thing makes all kinds of music and you can add vocals or real instruments to backing tracks you have made.
I, whilst loving music, have never been able to play anything. After messing around with this for a while, I managed a rubbish rhythm track.
I imagine you could use this in conjunction with your site to actually get some music out there.
It's complex and I couldn't understand most of it but it does produce an amazing array of sounds and does sound "professional."
and it looks like this: