Hello, I have no experience being a crab or making music, I made some kobold sounds and stuff I can send a link to things that I did the sound for if you want. But I have no musical talent. Are you going for realistic crabs or amazing crabs?
Here is some of my work.
Kobold Slide by Moonbow Entertainment, BlackDrake21, Gawain (DarkGriffin) (itch.io)