If you aren't familiar with the rare beast known as the "singing DJ," check out Swedish crooner Jens Lekman's oddball set at BrooklynVegan's CMJ party. With acclaimed acts ranging from B'more popsters Ponytail to funk revivalists the Phenomenal Handclap Band, this shindig is stacked, and the price of admission is worth it just so you can find out the identity of the special guest. Last year's showcase was kicked off by a then-unknown Bon Iver, so be sure to arrive early to catch Emmy the Great.