Richard Pennycuick (who should give up on understanding the offside rule,
since even professional referees obviously fail!):

>....Prokofiev's opus numbers in such instances use "bis".  Is this the
>practice only for French music publishers, or is there some other
>significance to it?

Don't know -- but I will add some confusion.  It's not only used in Opus
numbers but also in work titles on occasion.  For example, Villa-Lobos'
"Two Choros Bis for violin and cello"

Tim Mahon (Always happy to add a question in place of an answer)
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