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Thanks krauton but I must be being thick. How does e-la = the highest note?

"highest note in the scale of musick" (old word)
An Universal Etymological English Dictionary Comprehending the ...
https://books.google.co.uk/books?id=b2vX0vFqXQcC
1724
E-LA-MI, the fisth ascending Note of each Septenary in the Scale of Musick. To ELA PIDATE ... ELA, [perhaps of Elva, L.J the highest Note in the Scale of Musick.

Thanks kirky. I have now found it in my Chambers Crossword Dictionary.