Some sounds are left unused and not heard in-game

some sounds that were implemented to the game were never used in minecraft. They can be heard through the playsound command.

List of sounds (May be incomplete).

• item.trident.thunder (Channeling sound, see MCPE-43402)
• crossbow.loading.end (Crossbow end sound; MCPE-43401)
• mob.dolphin.attack (Dolphin attack sound)
• mob.dolphin.play (Intentionally unused, MCPE-33444)
• mob.shulker.close.hurt (MCPE-40111)
• entity.zombie.converted_to_drowned (Zombie converting to drowned)
• mob.drowned.shoot (Trident throwing sound, MCPE-50609)
• mob.dolphin.jump (MCPE-37229)
• Skeleton arrow shooting sounds (MCPE-50609)

Examples: Throwing a Channeling trident at a mob, only the lightning sounds play instead of the actual Channeling sound itself.