I hadn't known about that YouTube feature to slow it down - thanks.
Can YouTube change the pitch on the fly too? At band practice we often kick around song ideas, but we struggle to choose a good key until I can get home, DL a copy and play with the pitch.
I also use VLC and Audacity - both great programs.
Youtube doesn't change pitch, unfortunately. But there is an external footswitch controller that allows you to access the start/stop/slow/loop functionality that makes it super convenient when working on songs.