You guys may have heard of Darwin Tunes before. If not, it is an experiment on evolutionary computation, where small music samples are automatically generated, and evolved based on feedback from the public.
After you give feedback to any particular sound loop (follow the instructions in the side), you are given a link to download the loop you just heard. The loops are CC-BY-NC, so I guess they could be used for LD?
Most of them sound really cool, so this seems like a good alternative for those of us without great musical talents