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The production has been around for a long time. For this recording, Idle replaced Richard Suart, who famously rewrote the List Song every night.

He published some of his favorites in They'd None of'em Be Missed, which is a fun read, especially if you're familiar with British pop culture in the 90s and early aughts.

Vocal score or orchestral score?

Vocal score is available on Amazon:

G. Schirmer Edition of the Gondoliers: or the King of Barataria (Vocal Score) https://www.amazon.com/dp/0881887226/ref=cm_sw_r_cp_apa_i_h.eoEb7ZBKT9S

(Schirmer is pretty standard, but occasionally groups will use a different version, but if this is the case they'd probably tell you...)