Okay, maybe this is a little heady, but here goes... Somehow it's taken me 26 years of playing to acknowledge the huge impact of the note you play on the 4th beat of a 4/4 measure. From a rhythm standpoint, it's important because it helps to set up the downbeat. That part I've known for a while. But I'm talking about the HARMONIC influence it seems to have. A rock bass line with a chord tone on the 4 seems to have a stronger melodic feel (notice I didn't say BETTER) than a bass line with something other than a chord tone or pentatonic scale tone. Even if you put something else on "4&". It's weird. And not weird at all. I've always gravitated towards "chord-important" notes on the 4, but never really acknowledged that that's what I've been doing until last week. Why didn't anyone TELL me? And a jazz bass line (walking style) often sounds TOO pretty unless that note on the 4th beat leads AWAY from the chord, and towards the next chord. Again, that 4th beat is somewhat of a determining factor in whether the line is cool or not-so-cool, or something else entirely. Who else knows this? Teachers, do you teach this? Is this a part of theory instruction that I never got? Maybe you're reading this and realizing that you've been doing the same thing too. I'm very curious to see who else feels this way, or if there's some precedent to teaching the concept.