Fun. on The Tonight Show

Nate Ruess of musical guest Fun performs on The Tonight Show on June 18, 2014.

Douglas Gorenstein/NBC

fun. are back with a new song from their forthcoming third album called "Harsh Lights."

The members of fun. had been discussing their new album in interviews, so many predicted they'd share a new song when their name appeared as musical guest on "The Tonight Show with Jimmy Fallon." The predictions proved true, as the alt-poppers rocked out a new song that sounds like a continuation of their winning formula from 2012's "Some Nights."

The anthemic track features dramatic "whoa-oh-ohs" in its intro and an arena rock-meets-show tunes vibe throughout. Sings Nate Ruess in the chorus, "I'm slipping into midnight under harsh lights and nothing gets me down."

There is still no official release date or title for the new album, though fun. guitarist/songwriter/backing vocalist Jack Antonoff has an album of his own dropping soon. His side project, Bleachers, will release its debut album "Strange Desire" on July 15 via RCA. Check out Billboard's coverage of Bleachers at Governors Ball here.