▁" Wh atever ▁happened ▁to ▁my ▁Trans ylvan ia ▁Tw ist ? "). ▁It ▁was ▁passed ▁on ▁by ▁every ▁major ▁record ▁label , ▁but ▁after ▁hearing ▁the ▁song , ▁Gary ▁S . ▁Pa xt on ▁agreed ▁to ▁produce ▁and ▁engineer ▁it ; ▁among ▁the ▁mus icians ▁who ▁played ▁on ▁it ▁was ▁pian ist ▁Leon ▁Russell . ▁Iss ued ▁on ▁Pa xt on ' s ▁G arp ax ▁Records , ▁the ▁single ▁became ▁a ▁million ▁s eller , ▁reaching ▁# 1 ▁on ▁the ▁Billboard ▁Hot ▁ 1 0 0 ▁chart ▁for ▁two ▁weeks ▁before ▁Hall owe en ▁in ▁ 1 9 6 2 . ▁It ▁was ▁sty led ▁as ▁being ▁by ▁" Bob by ▁' B oris ' ▁Pick ett ▁& ▁the ▁C rypt - K icker ▁ 5 ". ▁The ▁track ▁re - enter ed ▁the ▁U . S . ▁charts ▁twice , ▁in ▁August ▁ 1 9 7 0 , ▁and ▁again ▁in ▁May ▁ 1 9 7 3 , ▁when ▁it ▁reached ▁the ▁# 1 0 ▁spot . ▁In ▁Britain ▁it ▁took ▁until ▁October ▁ 1 9 7 3 ▁for ▁the ▁t une ▁to ▁become ▁popular , ▁pe aking ▁at ▁# 3 ▁in ▁the ▁UK ▁Singles ▁Chart . ▁For ▁the ▁second ▁time , ▁the ▁record ▁sold ▁over ▁one ▁million ▁copies . ▁The ▁t une ▁remains ▁a ▁Hall owe en ▁per enn ial ▁on ▁radio ▁and ▁on ▁i T unes . ▁A ▁Christmas - th emed ▁follow - up , ▁" Mon ster ' s ▁Hol iday ", ▁( b / w