Martha Reader and The Vowelles: Tub

Martha Reader and The Vowelles: Tub is an installment in Martha Reader and The Vowelles series.

Plot
Martha Reader and The Vowelles sing the short "u" sound from their bubbly hit word "tub".

Lyrics
Martha Reader and The Vowelles/Lyrics

Missing Letter
t__

t u b

Adding Letters and Words
t + ub = tub

Only Appearance

 * Giants and Cubs