How young are you all guys?
It is just a cover version of a famous sketch by Jerry Lewis from the 1970s:...
Actually it ain't. It's a piece Leroy Andersson wrote in the 50s. He was famous for bringing exotic "instruments" into his classic compositions to create a sound corresponding to the theme of the piece. These light hearted, yet classic songs where later on often chosen as backround music for TV or, like the typewriter layed the base for a sketch.
That's why he often doesn't get the credit for his compositions although almost everyone knows them.
Reason for them using a reception bell instead of the typewriter bell is the latter is rather silent and the doorbell gives a better sound. Also notice how the percussionist playes by notation instead of just hammering on the writer.
The tuning of the typewriter beforehand however is a joke no orchestra playing this tune would drop out.