[GraemeJ]

Something that I suggested a while back was to show which songs in a setlist had been played - sort of the inverse of what you were asking. Anything you hadn't played would be marked in some way.

The reasoning behind this was that it's sometimes necessary to alter the playing order 'on the fly' - usually as a result of audience reaction (or, more likely, non-reaction). When that happens, there's often a discussion between the band as whether a particular number has been played that night. For a band that works regularly, it's sometimes difficult to quickly know the answer to this question .

Obviously, you wouldn't want charts to marked as played if you just skipped through them, but a 30 or 60 second delay would work well. If you're on a chart for that long, it's reasonable to assume you are playing it.