The New Penguin Dictionary of Music
Last updated: 17.12.19
Printed: 1980 Author: Arthur Jacobs
Publisher: Penguin Books Limited ISBN: 014051290X
Copyright: Arthur Jacobs 1977    
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Publishers blurb: "This fourth edition will completely supersede its predecessors. It is longer by several hundred entries; many of the old entries have been cosiderably enlarged in the light of new research, Both new and old material combine into a work of reference that will be indispensible for anyone interested in music.
My comments:
This "Dictionary of Music" is a light-weight alongside Dr Scholes's The Oxford Companion to Music but is nevertheless useful and is a good source for one- and two-liners.