 While Moon generally said he was only interested in working with the Who , he participated in outside musical projects . In 1966 he worked with Yardbirds guitarist Jeff Beck , pianist Nicky Hopkins and future Led Zeppelin members Jimmy Page and John Paul Jones on the instrumental " Beck 's Bolero , " which was the B @-@ side to " Hi Ho Silver Lining " and appeared on the album Truth . Moon also played timpani on another track , a cover of Jerome Kern 's " Ol ' Man River . " He was credited on the album as " You Know Who . " 
