Quote from MVboy39
I'm getting the exact same stack trace as you. I hope someone finds the solution soon.
EDIT: I found a fix! First of all, you may want to reinstall everything; I did that, but I don't know if it's vital. Then, go to the Minecraft folder (%APPDATA%\.minecraft on Windows). There should be a file called MenuAPI.properties. Open it with a text editor such as Notepad and paste the following in:
lastMusicIndex=2If it doesn't work, then good luck finding the problem.
That worked perfectly, thanks a lot mate!