Funny thing, the language he speaks is an actual language simply so i had some restrictions when having him communicate with the beings on Pandemonium. But anyway, i think its like something calm but not sad, just hums and stuff. Most of eotb i wrote wile listening to songs like Tír na nÓg and Téir Abhaile Riú so i think its something like that rhytmn. Cuz he wouldn't go to sea shanties, cuz he isnt originally a sailor, just a guy hehehe