Open them on individual browsers. 4 browsers if you want the extra drums, that would be five browser open and playing simultaneously. Have fun re-synching.
http://www.youtube.com/watch?v=_YqyJm9SpAo Bass player
http://www.youtube.com/watch?v=Se12JGfpCdY Lead guitar
http://www.youtube.com/watch?v=zuj4kkBY1RE Keyboard
http://www.youtube.com/watch?v=hpQS1Jde8QA Drums
http://www.youtube.com/watch?v=TO-f2H_fRMg Extra drums long play