Mark Hoppus has revealed that he recorded vocals for an unreleased Linkin Park track during a studio session, though his contribution never made it onto the final record. This collaboration attempt surfaced during a Q&A following the premiere of Linkin Park's film 'UNSHATTER', sparking curiosity about why such a high-profile pairing didn't reach completion. The disclosure highlights an interesting behind-the-scenes moment from the band's creative process and demonstrates the kind of experimental collaborations that sometimes remain shelved.

During the Q&A, Hoppus expressed bewilderment at his vocal takes being excluded, humorously asking what happened to them. Mike Shinoda responded diplomatically, suggesting that "You were greater than the song"—implying Hoppus's performance exceeded what the particular track required. Shinoda subsequently expressed optimism that future collaborative efforts between the two might prove more fruitful. The film 'UNSHATTER' arrives in cinemas from 30 September, with its soundtrack now available.