Jelli, a startup trying to shake up the traditional radio industry by letting listeners control what songs are played on air, has raised $7 million in a round of funding five months after raising a first round. With Jelli, radio listeners search through an online catalog of songs and vote on what tracks they want to hear; participants earn rewards which give them more control over what songs are chosen, turning the process into a sort of game. So far, Jelli says its technology is being used in 17 markets in the U.S. and Australia. The funding comes from Battery Ventures and First Round Capital. More details in the release.