For those of us with 76's or larger, I have always felt disappointed with the choice in benches (not stools, which allow no side to side movement). By and large, all I have seen is X-type benches, which by their very nature get unstable as you slide down to the extremes (and they are never as wide as a piano or organ bench).
Has anyone seen a lightweight folding piano bench durable enough for day to day gigging? Something with a leg at each corner, rather than the unstable X-type...
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An arranger is just a tool. What matters is what you build with it..!