Bosko is a construction worker who impresses Honey by making music from everything in sight, including a decapitated mouse, a typewriter and a goat filled with hot air.
Sound
Typewriter as percussion — pure 1930s ASMR.

Director
Hugh Harman
Trivia, insights & behind the scenes
Bosko was animation's first Black protagonist, though designed with minstrel stereotypes that aged like milk. Hugh Harman and Rudolf Ising created him after leaving Disney, making this essentially revenge cartoon history.
The 'Hold Anything' title is a pun on 'hold everything' — a phrase riveters actually shouted. The entire short is basically one extended construction-site musical pun that Warner Bros. recycled for decades.