A KompAppella - A KompAppella is like a loud, messy group of people singing

A KompAppella is like a loud, messy group of people singing without any help from real instruments, just their voices and their fury.

My friend’s KompAppella was so loud, the neighbors called the cops.

During my KompAppella, I yelled so much, my throat felt like it was on fire.

I did a KompAppella in the shower and my showerhead broke from the sound.