Maroon 5 was the musical guest on this weekend's episode of Saturday Night Live, but the second of their two songs was actually a Gym Class Heroes tune featuring the band's singer, Adam Levine. The band were joined by GCH rapper Travie McCoy for "Stereo Hearts," the first single from that group's new album The Papercut Chronicles II, which is out next week. The tune is a perfect merger of the two bands' respective styles – smooth R&B-accented rock from Maroon 5 and sunny rap-rock from McCoy's crew.