well i ageree a bit with the mucka, however you have to balance security with exposure, some sites DO get listened to by a&r's etc, but they are the top ones that make the charts on those sites.. or its best to enter your tunes when these sites are running competitions, that way its guaranteed that someone of cred will be listening to the tunes,,,so just be like me and check out those sites every now and then for updates to know when such contests come up. register with as many as you can still in the mean time.