Lyric discussion by elephant_range 

Cover art for Come in Number 51, Your Time Is Up lyrics by Pink Floyd

Yes, Vannaroth, it Exists. It is on the Zabriskie Point soundtrack (with a few other Floyd tunes). 'Number 51' is a studio version of 'Careful With That Ax, Eugene'. (Less heavy than on Ummagumma, but more creepy, and more keyboards).