Even though I don't play real bass, yet, I wanted to post this question on this side of the board as it applies more commonly to concepts applied by double bassists. I feel confident of my ability to create melodic and interesting bass lines over multiple chord changes. When the chord changes to a song are once a bar, or more, I enjoy making the transition to the next bar. I feel very comfortable of my ability to anticipate the next chord and create something that flows. My problem comes when one chord is repeated over several bars. Take for instance even the common 12-bar blues. If you have the I on the first four bars, after two bars I feel like I'm out of ideas. Because I don't have a new chord to move to I feel like the bass line can become stale or stagnated. There's a powerful Tori Amos-esque song my band is working on now that has a wonderful chord structure and is wonderfully melodic. I want to keep the bass line moving and interesting, and strong, as the piece is very strong, but there are two instances in the song where the chord sits on Ebmin. for 4 bars. Beyond just that last example, can anyone give me some tips on how to keep bass lines moving, original, and melodic under those circumstances?