Группа изначально базировалась в Phoenix, Arizona (USA) и называлась Bittersweets, затем добавив Ladd, сменила название на Twentieth Century Zoo.

Paul BENNETT • drums
Allan CHITWOOD • bass
Greg FARLEY • guitar
Paul "Skip" LADD • guitar
Bob STUKO • vocals, harmonica
Randy WELLS • drums

7"
You Don't Remember / Clean Old Man It (Caz) 1967
Love In Your Face / Tossing And Turning (Caz) 1968
Rainbow / Bullfrog (Vault) 1969
Only Thing That's Wrong / Stallion Of Fate (Vault) 1970

LP
1. TWENTIETH CENTURY ZOO (Vault) 1969