Passion Pit is Jeff Apruzzese (from left), Michael Angelakos, Nate Donmoyer and Ian Hultquist
It’s impressive that Passion Pit — a Cambridge, Mass., indie-rock band with two albums to its credit — recently headlined at Madison Square Garden, the 18,000-seat venue Billy Joel once hailed as “the iconic, holy temple of rock and roll.” Even more impressive is that …