Why should you join Soundcloud? Well, for starters it doesn't add the stupid metadata (a number tag in the title and album information) that Newgrounds does when you download a song. Secondly, you can subscribe to people! Why doesn't Newgrounds at least do that already? Stupid.
Thirdly, it's the future of online music!

Here are some people from Newgrounds you should start following, for starters. They all post regularly on Soundcloud:
Me, aka SBB
Haywyre aka haywirehaywire
SineRider
midimachine
Sorohanro
DubAudio
xKore
Prodigal

(If you're on Soundcloud feel free to post below and I'll follow you if I think you're pretty great)