Sure, it's just a marketing gimmick, but if you ever find yourself in need of tunes while you're on New York City's Williamsburg Bridge, there's an app for you.

A new app released by the Uno! record label -- an EDM label most famously home to rapper Mykki Blanco -- plays music from the label's roster as commuters pass over the bridge, which spans the East River between Brooklyn and Manhattan.

The Williamsburg Bridge Radio app was built by the advertising agency Sid Lee. It plays a high energy track while users are ascending the bridge, and a lower-energy song on the way down.

"We all take our bikes over the bridge and push very hard and then coast to the beautiful view, and we decided there should be a soundtrack for that," Sid Lee creative director Cecilia Azcarate told Brooklyn Paper.

The app is free to download, but it won't switch on automatically for you unless you're standing at the foot of the bridge.