 Barrett had one noted reunion with the members of Pink Floyd , in 1975 during the recording sessions for Wish You Were Here . He attended the Abbey Road session unannounced , and watched the band record " Shine On You Crazy Diamond " — a song that happened to be about Barrett . By that time , the 29 @-@ year @-@ old Barrett had become quite overweight , had shaved off all of his hair ( including his eyebrows ) , and his ex @-@ bandmates did not at first recognise him . Barrett 's behaviour at the session was erratic ; he spent part of the session brushing his teeth . Roger Waters finally managed to ask him what he thought of the song and he simply said " sounds a bit old " . He briefly attended the reception for Gilmour 's wedding to Ginger that immediately followed the recording sessions ; however , he left early without saying goodbye . 
