I'm looking for a media player that lets you play around with the pitch/tempo while listening to the song.
also would be nice if it can play:
.flv
.wmv
.avi
Thanks 
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Audacity portable will allow you to play around with the sound (sound modifier)
Go here for a description:
https://portableapps.com/apps/music_video/audacity_portable
VLC Media Player Plays Audio and Video too. But it doesn't edit the sounds.
https://portableapps.com/apps/music_video/vlc_portable
Try to look around the site before posting (I learned the hard way.)
Good Luck!