The sounds for 1.9 snapshots are not working for some reason.
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All sounds or music ?
The latter is MC-91803, if that's affecting all sounds , please check your audio settings, check for errors in the game output console of the launcher when loading the game.

all sounds. My audio settings are all full.

I have the same problem there is no minecraft sound.

Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".

Something went wrong when downloading the sounds:
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.break
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.destroy
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.fall
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.hit
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.land
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.place
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.step
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.anvil.use
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.brewing_stand.brew
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.chest.close
[21:50:22] [Client thread/WARN]: Missing sound for event: minecraft:block.chest.locked
Stop Minecraft & Launcher
Delete the folder
[.minecraft/assets/|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
Restart Launcher
Sounds & rest will be (re-) downloaded

This is a technical support issue; this site is for bug reports only. For technical support please use the Mojang Support Center.

still the same. and there is no fix on the mojang support center.

Please use the Minecraft Help Chat