Speeding up a whole mix in PT?

Hey guys,



I have a client asking to speed up a finished song. The engineer who mixed it is out of town and I wanted to take a stab at it myself, any guidance on how to do this in Pro Tools without the songs changing key, or without artifacts?



And is it better to apply to mix session or bounce the mix and apply to stereo track?



What is the best way to achieve this?





Thanks