Sleigh Bells don’t only represent Christmas time. The words stand for a musical oddity, a weird mix of catchy pop melodies and electronica mixed with grungy guitar. The Sleigh Bells duo of Derek Miller and Alexis Kraus create experimental pop very reminiscent of artist MIA. They are about to drop their first album, the Treats LP. Before that comes out, catch them May 4 at Webster Hall with Yeasayer. Tickets are $20 in advance, $22 at the door.