What are a couple of sites to download free mp3s?

The only ones that i know of are from the gnuttella network... these are constantly under a legal attack and ever changing as to the brand of software to use to connect with... the ones available now are week compared to the way they were before... I am a programmer and actually trying to establish connections via my own software...the last one I had was Phex it does work but not well...to get a couple songs for your collection is about all it is good for from what Ive seen so far....if you try (I have my own copy but constantly studying and on here ande have not tried it yet for more than a minute) lemme know how it works for you