It's not that Rubblebucket disappeared over the past year or so, though the Brooklyn band did ease back slightly on its tendency to tour hard — but only so singer Kalmia Traver and bandleader/trumpeter Alex Toth could write new music. Those efforts are about to bear fruit: Rubblebucket releases a new EP, "Save Charlie," in September, and Speakeasy today premieres the title track.

Recorded in Brooklyn with Tom Biller, who co-produced with the band, "Save Charlie" follows last year's EP "Oversaturated,"...