How do i get a song onto my myspace profile if the band doesn't have that song listed?

Yes, you can. One way is to go to the myspace music section and type their name in. If you do not find anything, then go to google and type in the song and artist and add mp3. Download it onto your computer, make a myspace music page, and upload the song there. It's a lot of work or you could just go to myflash i guess...