Wiz Khalifa’s “Black & Yellow” has now sold over a million copies, and even though he hasn’t really put anything out on a label, he’s obviously a star now. A big enough star to play to riotous crowd on 106 & Park, in fact, as he did last week. Performing his “Black & Yellow” to a crowd that knew most of the words, Wiz looks pretty comfortable here. I’m not generally a fan of his “I smoke weed, have you heard of it?” schtick, but when I catch this song on the radio, it’s hard to remove from my frontal lobe. It’s at least cool that his best song is also his most popular.