EDIT: They changed it back, everything's cool.
Basically, now anyone can make money off of your songs without paying you! If you've submitted music to NG, this is a big deal and a huge blunder on NGs' part. Musicians deserve to get something when someone makes money off of their songs!
I'm gonna delete my songs if this change is permanent. Guys, PM the administrators and tell them to change it back to Attribution, Non-Commercial, Share-Alike!