- You Got Your Armies
- You Never Know Who Your Friends Are
- Young And Monde
- You're Just Insultin' Me, Aren't You!
- You're Probably Wondering Why I'm Here by The Mothers of Invention prod. by Tom Wilson
- You're Probably Wondering Why I'm Here (basic tracks)
- You’re Probably Wondering Why I’m Here (Live From Edinboro, PA - May 8, 1974)
- You're Probably Wondering Why I'm Here [Unmitigated Audacity]
- You're Probably Wondering Why I'm Here—Vocal Overdub Take 1 (Incomplete)/Take 2 (Incomplete)
- Your Mouth
- Your Mouth (Take 1)
- Your Teeth And Your Shoulders And Sometimes Your Feet Goes Like This.../Pojama Prelude
- You There, With the Hard On!
- Zanti Serenade
- Zappa Weezer Monkee Beatle by Charles Michael prod. by Charles Michael
- Zolar Czakl by The Mothers of Invention
- Zolar Czakl [Meat Light] prod. by Gail Zappa & Joe Travers
- Zolar Czakl (Mix Outtake) [Meat Light] prod. by Gail Zappa & Joe Travers
- Zomby Woof by The Mothers of Invention
- Zomby Woof [Return Of The Son Of...] by Dweezil Zappa prod. by Dweezil Zappa