Sometimes when opening Minecraft, it wont play sounds for a short time. (MENU SOUNDS, if going to game sounds work)
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Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
Please attach .minecraft\output-client.log
This is because sounds are loaded asynchronously in the background. We may change this in the future, but it will require a new launcher.
Oh ok ;D
I have the same issue and the same configuration. Macbook Pro, BootCamp, Windows 8.

Please read two comments above yours:
[Mojang] Jeb (Jens Bergensten) added a comment - 05/Mar/13 11:19 AM
This is because sounds are loaded asynchronously in the background. We may change this in the future, but it will require a new launcher.
@Jeb: Now that there's a new launcher...
BTW, is this really "intended," or is it just a won't-fix?
This was some stacktrace leading up to me not being able to have sound.
Still happens, and this was 1.9.1 pre 3
[12:50:33] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:50:33] [Thread-5/INFO]: Initializing LWJGL OpenAL
[12:50:33] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
[12:50:33] [Thread-5/ERROR]: Error in class 'LibraryLWJGLOpenAL'
[12:50:33] [Thread-5/ERROR]: Unable to initialize OpenAL. Probable cause: OpenAL not supported.
[12:50:33] [Thread-5/WARN]: ERROR MESSAGE:
[12:50:33] [Thread-5/INFO]: Could not locate OpenAL library.
[12:50:33] [Thread-5/WARN]: STACK TRACE:
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:156)
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:102)
[12:50:33] [Thread-5/INFO]: org.lwjgl.openal.AL.create(AL.java:206)
[12:50:33] [Thread-5/INFO]: paulscode.sound.libraries.LibraryLWJGLOpenAL.init(LibraryLWJGLOpenAL.java:164)
[12:50:33] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandNewLibrary(SoundSystem.java:1576)
[12:50:33] [Thread-5/INFO]: paulscode.sound.SoundSystem.CommandQueue(SoundSystem.java:2572)
[12:50:33] [Thread-5/INFO]: paulscode.sound.CommandThread.run(CommandThread.java:121)
[12:50:33] [Sound Library Loader/WARN]: ERROR MESSAGE:
[12:50:33] [Sound Library Loader/INFO]: Could not locate OpenAL library.
[12:50:33] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:50:34] [Thread-7/INFO]: Switching to No Sound
[12:50:34] [Thread-7/INFO]: (Silent Mode)
[12:50:34] [Sound Library Loader/INFO]: Sound engine started
[12:50:35] [Client thread/INFO]: Created: 1024x512 textures-atlas
[12:50:48] [Server thread/INFO]: Starting integrated minecraft server version 1.9.1-pre3
[12:50:48] [Server thread/INFO]: Generating keypair
java.lang.NullPointerException
at vp.a(SourceFile:412)
at vr.a(SourceFile:215)
at azp.a(SourceFile:52)
at lp.b(SourceFile:142)
at byl.a(SourceFile:98)
at byl.j(SourceFile:130)
at net.minecraft.server.MinecraftServer.run(SourceFile:427)
at java.lang.Thread.run(Unknown Source)
See MC-9974.