I think you can't get ringback through myspace, it is not a like a music file you upload to your phone, but unfortunately you have to make a contract with a provider who will then setup your phone connection to have certain tunes. I set it up so that my girlfriend will alway receive her favourite Aerosmith ballad while waiting for me to answer the phone (don't laugh ).
As a scratchy scratching song the first one that comes to my mind is "3 MCs and one DJ" by the Beastie Boys.
Don't know "feels like a stranger", who made that song? Maybe they have it on ect, though.