Below each posting window, there is now a 'Now Playing' box, so you can just enter whatever you're listening to into it, and it will automatically add 'NP: Whatever by Whomever' under your post.
Some people might do that themselves already, but I always forget ![Wink ;) ;)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)