Reply to Vocal Shifting

I was wondering if anyone knew how to shift the tone of a vocal sample, giving it a higher or lower pitch in frequency. Here are a couple of examples:
http://www.youtube.com/watch?v=pAUXg3IeZ_c
http://www.youtube.com/watch?v=q8Ksv7CQxpc
I run ableton live. Any help is very much appreciated. Thanks guys.