Audio Creation - Backing Track Loops

I am looking for someone to create 25 very short backing tracks that are loopable. I have designed a program that functions like an mp3 player that will loop each audio track indefinitely, so now i need the audio. The audio need to be 4 or 8 bars long, so 5 - 15 seconds in length, or longer if you prefer. All 25 audio tracks need to be in the same style - however, you can pick the style (preferably rock, metal, blues, country etc) and i am looking for AS MANY AS POSSIBLE! If you can provide 5 sets of 25, then you will get paid 5 times. I need a variety of audio sets, different styles of music ranging from everything from rock to hip hop and dance, so any style is OK. Please bid now, for 1 audio set of 25. The lower the better, as i need a lot done.