One of my bandmates brought an original to practice. Pretty cool. We are a blues band and kinda was surprised. At one point in the song he just ramps on the 4 and 5 back and forth for a while (songs in D) am i correct in my theory that I could fancy up a bass line for this part in the song with a G lydian or A mixo Lick? also what kind of lines sound good over a Sus 4 chord?