Martha Reader and The Vowelles: Fun

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

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

Lyrics
Martha Reader and The Vowelles/Lyrics

Missing Letter
f__

f u n

Adding Letters and Words
f + un = fun

Only Appearance

 * The Roar That Makes Them Run