Sound Event Bracket Handler
The SoundEvent Bracket Handler gives you access to the SoundEvents in the game.
Check this for a list of vanilla sound events!
SoundTypes are referenced in the Sound Event Bracket handler this way:
Vanilla
<soundevent:name>
<soundevent:ambient.cave>
Mod Added
<soundevent:modID:name>
<soundevent:minecraft:ambient.cave>
If the soundType is found, this will return an ISoundEventDefinition Object.