Today I was messing around in Halo and having the guitar in.

I was able to have it set that tilting the controller down it would melee.

Which is Axes #3+

Here is a video I did:
http://www.youtube.com/watch?v=_PLoVOVoObg
(I just uploaded it so it might not be up right away)
[Ignore the random talking and PREY noises in the background]


*Edit*
I guess someone else has done it also:

http://www.youtube.com/watch?v=rBXaqP7CVcs