I am playing with a band and relearning songs. So I thought I would use YouTube. After,tuning to what I know these song are recorded to, I play a video and it's off, not in tune...I check my tuning it's good. Try again, and same thing, find a different video and it matches.....so why are these videos being altered in the recording, and is it on purpose. I am not talking compression I am talking pitch. I assume it's the method of recording. Has anyone else notice this?