Nicholas Berkeley "Nick" Mason (born 27 January 1944) is an English drummer and songwriter, best known for his work with Pink Floyd. He is the only constant member of the band since its formation in 1965. Despite solely writing only a few Pink Floyd songs, Mason has co-written some of Pink Floyd's most popular compositions such as "Echoes" and "Time". Mason is the only Pink Floyd member to be featured on every one of their albums. It is estimated that as of 2010, the group have sold over 250 million records worldwide, including 74.5 million u…