Hello- New to Bass here so I apologize if this has been brought up before and if this seems to be a sophomoric question. If your playing a song in a I IV V chord progression say in the key of E ( 4/4 time ), as a bass player you certainly are not going to be playing the first 4 bars (in E ) by just plucking the E note 16 times and so on with the next chords ? The reason I ask is because I see Bass players playing 2-3 other notes besides the E in each measure and I am wanting to know if those other notes are all notes that would be in the E scale? And, would you maybe do the same thing when it comes to playing the other notes in the other measures, in other words , A and B , would you play the notes in the scales of both the A and B as well ? Just a couple of tab books I've seen ( I know most tab is not completely correct ) seems to follow that pattern of notes in the scale being played to whatever the chord in that measure is. I hope I haven't confused you all ? Any and all help/replies will be greatly appreciated !