The Imagine Dragons singer has done a lot for the quartet, from getting them signed to taking them on tour to co-writing their song, "Stranger." That said, singer Sam Harris told Radio.com the absolute best thing he's done is help them finally figure out the instrumentation of their first single, "Unconsolable."

"Unconsolable" was something Harris and his bandmates � guitarist Noah Feldshuh, drummer Adam Levin, and brother, Casey � had been toying with for years.

It started with Sam and Feldshuh, who have been friends since they were just six years old, playing around with a Casio keyboard one night five or six years ago. They created a guitar loop that would later become the melody. Then Sam just started singing the song's opening line, "I hope we stay thick as thieves, butter and bread, pillars of colonial homes," before writing the rest of the song, which was about growing up in the college town of Ithaca, New York.

The band recorded the song three different times and added different layers over time, from a number of loops to a saxophone breakdown to a toy keyboard. But it was Reynolds who told them to strip it down.