Steve these guys were the best of the lot watch the video again.....they did this every night and were a well oiled machine who could play together like it was second nature. During practice in high school orchestra bands, I played Alto sax & Percussion/ Timpani the conductor would go through the whole band and make you play YOUR parts SOLO in front of everyone to see if you were playing your part PERFECTLY, no slackers hiding behind anyone you had to pull your weight big time by yourself before you played all together. High modern Technology has made the music world all slackers of a sought & in my opinion ruined "REAL" playing as it used to be