Dan Levine is a horn player who often joins TMBG both live and in the studio. He played trombone on "Mr. Xcitement," "Doctor Worm," "No!," and multiple songs on The Spine, Here Come The ABCs (to which he also contributed his skills as a tubist), The Else, Here Come The 123s, Here Comes Science, Join Us, Glean, and Mono Puff's It's Fun To Steal. Dan's niece, Hannah Levine, contributed some vocals to Here Come The 123s. She can be heard on "Zeroes" and "Ooh La! Ooh La!" and singing lead on "One Dozen Monkeys."
- Dan's Myspace profile (recovered with the Wayback Machine)