I'm just a noob (well not a total noob, I've playing for a year, but you know... xD). I have a band and we're starting to write our own songs. We base our songs on chords, and to write the basslines, I always use the scales (basically because I don't know another way to do it xD). I mostly use the 1st note of the scale (of course), the 3rd, the 5th, the 8th, and sometimes the 4th. I also play the lower 5th, and sometimes I even play two notes at the same time, usually the 5th and the 8th. For the endings I usually play arpegios. How do you guys write your basslines?