/obj/item/christmas_horn
name = "Christmas Horn"
desc = "Only on Christmas!"
icon = 'icons/obj/christmas_horn.dmi'
/obj/item/christmas_horn/var/sound(s)
sound('sound/music/Christmas_Horn.wav')
Problem description: I am trying to add sound to this object but, I always get a bad variable definition compile error.
You had a number of syntax issues there.