Punk rock heroes Green Day unveiled their new album title last night (February 8) at the the 51st annual Grammy Awards.The band, who have been recording the follow-up to 2004's multi-million selling American Idiot, presented Led Zeppelin frontman Robert Plant and Alison Krauss with Best Album for Raising Sand, and announced that their new album will be called 21st Century Breakdown.21st Century Breakdown will be released in May through Warner Bros.