Changing BPM of sample and changing keys.

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I have been wanting to try making remixes for quite some time but I've been stalling it because I cant find a way to change the key and BPM of a sample. Is there a way to do it in lmms or even audacity ?
Yep. You can use Audacity for that. :)

Here's the read, on changing the tempo, for a sample or track.

This is for changing pitch, of a sample or track.
For anyone reading:

Audacity is a really good free tool, for these kind of things.
You can even add cool effects, to sounds, samples and even tracks etc. :)