What co-founder of the band Pink Floyd wrote and performed "Granchester Meadows"?
Grantchester Meadows (song): "Grantchester Meadows" is the second track from the studio disc of the experimental Pink Floyd album "Ummagumma." Grantchester Meadows (song):  It was written and performed entirely by Roger Waters. Roger Waters:  In 1965, he co-founded the progressive rock band Pink Floyd with drummer Nick Mason, keyboardist Rick Wright, and guitarist, singer, and songwriter Syd Barrett.
Roger Waters