I’d never heard the term Indietronica before, but it does accurately describe Passion Pit’s music. Here’s Wikipedia’s definition:
Indietronica (also called Indie electronic) is a music genre that combines indie, electronica, rock and pop music. Typical instruments used in indietronica music are the electronic keyboard, synthesizer, sampler, software synthesizer, MIDI controller, and drum machine. It is also closely related to the relatively less electronic and more acoustic Chillwave (glo-fi) movement.
Michael Angelakos founded Passion Pit when he released Chunk of Change, an EP that was a Valentine’s Day gift to his girlfriend. The band expanded from a one man operation (Michael used a laptop to perform) to a four piece soon after Chunk of Change was released. The music is fresh and saturated with electronic samples evened out by catchy vocal hooks.
Here are two tracks from Passion Pit. Incidentally, the second video, Sleepyhead, was listed on Pitchfork Music’s list of top 40 music videos of 2008.