Quote Originally Posted by jeroenliebregts View Post
i have a question about this:

As far as i know records are produced on different tempos, and some of them are 'tonal' enough to say they are written in a certain key. But as soon as the music is pressed on vinyl, tempo and key are connected.
So how do you mix an 136 bpm record with a 137 bpm record of the same key?
That's the thing jeroen, it's all about relative key.

They have to be in-key at the same BPM.

The easiest way to tell this is to beatmatch them and see if it clangs or not.

There really is no point using analytical tools, your ears are your best bet.

Very rarely will a track be in perfect C, or perfect G minor or whatever.

It'll be microtones out.