I feel music in layers laid down by various instruments. Layer one is the drums, the white sound, the basis on which the other music is built. Layer two is the bass, the surging groove to which all higher layers must attach themselves to become part of the whole. The upper layers (guitar, keyboard, horns, etc.) ebb & tide around the bass but always come back to tag up with the bass theme. Rarely if ever does a good bassist venture out of his/her layer and even then only to return quickly. I could tell you more but you wouldn't understand it.