Forming during pop-punk trio blink-182's 2005 hiatus, +44 brought blink alums Travis Barker (drums) and Mark Hoppus (vocals/bass) back together as their former bandmate Tom DeLonge went off to form his own band, Angels and Airwaves. Originally billed as a largely electronic-based project, their songs eventually fell instead under the alternative rock umbrella; their name came from the international dialing code to the United Kingdom, where the duo first discussed doing the project. ~ Corey Apar