BestPractice 1.03 An open-source audio time-stretching tool for Windows

BestPractice is a musician's practice tool, to slow down or speed up music, either from an MP3 file or directly from a CD. Ordinarily the sound is distorted when slowed down our sped up - you get the effect like when playing a 33 rpm record on 45 rpm speed (remember the Chipmunks?). BestPractice tries to correct this, so you can slow down and speed up music, while keeping the original pitch. It is also possible to change the pitch of the music without affecting its tempo. Play along with for instance Eb tuned guitars without retuning your own, or slow down that high-speed guitar solo on a CD that you like to learn.

This splits up in two parts: "why is BestPractice made?" and "why would I use it?"
To start with the first: I saw that there were programs available on the internet that do this, and you have to pay for them ($20 to $50). Since I thought: 'I can do that', I had to prove it, right?

And for part two - well, there are probably more reasons, but those I can think of are:

• Your favorite musician plays a solo that you want to study, but you can't figure it out on normal speed
• You'd like to transcribe music, but need to slow it down to hear it right
• You can tune the song to your instrument instead of the other way around
• You'd like to sing along, but you need to change the key to match your voice
• You're learning a foreign language and you'd like to slow down the spoken examples
• You're like me and like to fool around with audio and/or digital signal processing
• You think that playing Celine Dion at rave speed is fun =D