I often hear people speak of playing ahead of or behind the beat. Can someone explain how or if that applies to bassists? To my mind, there is only 1 beat, and that is generally played by the bass - whether I'm playing 70 bpm or 130. Now, your mando chop (or other instruments' backbeat) can vary, to give different effects, and the bass can speed up or slow down, but I don't understand how the bass plays anything other than THE beat. Thanks - and happy new year - in advance, guys!