Conversation accidentally overheard in a concert hall:

“…………It’s a Debussy piece, which he authorised with the publisher years before.  But in this later edition a number of notes had been added in bar 232.  There’s nothing wrong with the new notes , but I personally  think that modern instrumentalists should play the original version”.

“There’s a word used to describe an alternative set of notes that can be played as the performer wishes.”

“Is there?”

“Yes. Ossia”.

“That’s brilliant.  How on earth do you know that?”

“I read about it in your own book on music theory.”