What's the difference between a bass line that goes in this pattern-A, E, G, A, G, E (that one seems to be more prevalent in blues) and one that goes A, C#, E, F#, A, F#, E, C# (this one seems to be more prevalent in rockabilly)? I'm talking about the pattern on the fretboard. Is one called one thing and the other another? I'm just asking in case I'm ever in a position to play with a group and they tell me the key but not the pattern. If that makes any sense.