“3’s and 7’s” was released as the second single off of Era Vulgaris. Despite the misleading name, skittish guitar and erratic tempo changes, this song is actually in a run-of-the-mill 4/4 time signature until the coda.

During an acoustic set, Homme stated that it was a song about lying.

The band performed the song during Popworld 2007, but instead of using instruments, they used laptops while Josh sang, in a tongue-in-cheek commentary about the then-rise of technology in music. It was very reminiscent of the band Kraftwerk’s style of musical performance.