Coldplay were at the Rock Werchter Music Festival in Belgium over the weekend, and like most other touring musicians on planet Earth in the past week, snuck in a Michael Jackson tribute at some point during their set. Above, Chris Martin does a somber rendition of “Billie Jean” (thnx vdub), the best Michael Jackson song ever. Below, “Billie Jean” by Amanda Palmer, Pete Doherty, Madonna, The Streets, and… Coldplay (the non-somber version)…