Sometimes, you're signed up to play something with a distinctive bass line, which doesn't lend well to improvisation, that repeats, repeats, repeats, repetitiously. How to deal with it and not go bonkers? A good example might be Doors, Riders on the Storm. It was I'm pretty sure, a Rhodes key-bass line. Not hard to play at all. But the main riff just repeats and repeats. Then there are the extended keyboard solos and the inevitable 28-minute long guitar wankfest. Even if the band is pretty disciplined and sticks with the "as-recorded" song, there's still a lot of da-da-di-da-da-duh-da.... over and over stuff, without a lot of "re-centering" cues if one wanders off the charted bass line. Thing is it sounds tight, played right. But my mind starts to wandering about stimulating topics, such as "what thread size is a garden hose anyway? Why is it called a thread? If I don't have a garden, is it still a garden hose if used only to wash a car?" and of course eventually, "uh, what beat are we on?"