FM was really driving that point home last class. It is so important. Sure having 15 - 20 musicians playing at (in) the same time, in a relatively small room, is a difficult task. If you listen close enough you can even pick (pun intended) on some of the pro's. When I try to figure out a new song, get familiar with the chord progressions and melody, I reach a point when I think I have it....but no. I just doesn't sound right. I certainly don't hit all the cords or notes right but what I've discovered is that it's the strum patterns, timings, pauses, etc. that give a song that finished flavor. It's like turning this ggggccggdcg into this Gg Gg cc Gg d c g. You really have to be conscious of it and incorporate it into your practicing/playing. I for one have a long, long way to go but there are definitely rewards for those willing to make the journey.