/playsound command will not play all sounds. The sounds themselves work fine in the game. The bug affects single player and multiplayer.

Steps to reproduce:

1. Make clean install of Minecraft 1.7.4
2. Create a single player game
3. Run /playsound random.glass YourNameHere ~0 ~0 ~0 1 1
4. See the error on the console ([Client thread/WARN]: Unable to play unknown soundEvent: minecraft:random.glass)

I know for sure that the "random.glass" sound is not working but I suspect there might be other sounds as well that are affected and not working but I cannot confirm.

Other users on my server have confirmed that they experience this bug as well when I tried the /playsound random.glass command on them. They did not hear the sound and received the console error.

I have attached my log where you can see the error.