I was just wondering if I was allowed to put my watermarked music which I am selling here, on my myspace page and post a link there to this site?
you sure can! In theory since you are not exclusive to AJ (yet perhaps) you could put them up anywhere you please. As the principle owner of the song you could in theory put them up for free download… though what good that would do your sales is a question to ask ;D.
Get the songs heard, by all measures you can.