Tonight, local DJ collective The Vinyl Retentives hosts its monthly "Freeform Friday" at Merge. The party starts at 10 p.m., and there is no cover. That means free tunes, and these will likely be tunes you won't hear anywhere else, as the Retentives describe their respective record collections as "embarrassingly good." DJs Needles Numark, Fjordan Turlingua, and King Eider come from widely diverse musical backgrounds and preferences, so you won't be hearing any Top 40 hits at Merge tonight. But the Retentives may just play an attention-grabbing cut from your new favorite band - the one you haven't heard of yet.