Cosmo Brown’s Symphony nr 1 “Giocoso (GEE! Oh Cos oh)” (смешанная)

Cosmo has to step away from work for a few days, which means they all have to put a bit of effort into communicating. Luckily the time off means he finally finished his (first) symphony.
Written in the symphonic form, and shamelessly based around that one time Kathy was thinking in English and Cos was thinking in music and they made a pun.