Apropos of not much, I have a copy of this book, bought when it was first published. It has the distinction of the only book I have ever bought that came with uncut pages; the torn edges of the pages (opened with a paper knife) give it a feeling that no other book of mine has. But my point in mentioning it is that the main bulk of it is overwhelmingly taken up with instruments that are not part of the western classical music tradition.
A typical page, opened at random, contains the entries (only summarised here):
Hornprinzipal (an organ stop)
Hornwerk (an organ whose pipes all sound simultaneously, as a signal calling to worship)
Horologium (a wheel with bells on, which tinkle when it is rotated)
Hörpauke, Hörpaigge (variant of Heerpauke: a kettledrum, or an organ stop imitating a drum)
Hosanna (a small carillon patented in France in 1898)
Ho sheng (see Ho: a small sheng of China, with 13 pipes)
Hourglass drum (a drum smaller in the middle than at the ends, found in Asia, E. Africa, Melanesia)
Hpa si (see Ka si: Burmese bronze kettle gong, with four pairs of ornamental frogs - also Kaun chet)
Hruozza (Cruit; glossed in 10th c. as Sambuca)
Hsiang ch'ih (percussion stick of china made of redwood; in N. China, used at funerals)
Hsiang pan (percussion plaque of China, made of thick brass)
Hsiao (end-blown flute of China; full name Feng huang hsiao, modern version is Tung hsiao)
Hsiao ku (small frame drum of China, played with a knobbed withy)
Hsiao tse (= Ko ling)
Hsien tse (= San hsien)
Hsing erb (Chinese cymbals; in N. China, almost hemispherical in shape)
Hsing lung sheng (Chinese term for organ, introduced from the West by Kublai Khan)
Hsiian (ovoid globular flute of China, known since the Shang period, of bone, clay or porcelain)
It's the kind of book you can get lost in for hours following cross-references.
The word "ethnic" does not appear (of course!). The preface says: "...this dictionary in incomplete. [...] listed well over five thousand books and papers on non-European and folk instruments alone;".
