'Stereo Hearts' is a song that has almost been overplayed on the radio and probably didn't need to receive the 'Glee' treatment. But since this is a show about music and an episode about love, a track ...

The Benny Blanco-produced track kicks off with Levine's sweet pipes crooning the chorus: "My heart's a stereo / It beats for you, so listen close / Hear my thoughts in every note / Make me your radio ...