These instruments are categorized into idiophones that produce sounds due to vibrations on the surface of the instrument and membranophones
that produce sounds due to vibrations on a stretched membrane, which include drums.
In the general classification of instruments they are divided into two categories, membranophones
This does not apply, however, to the last six membranophones
in the collection, tympani (kettle drums) that have been preserved in the castle not as separate pieces, but in pairs, with one pair still on its original base in the form of a high tripod.
Une section est un ensemble d'instruments melodiques identiques, jouant donc la meme partie, ou dans le cas de la section rythmique, un ensemble de differents membranophones
et idiophones non melodiques executant des parties complementaires mais formant un sous-ensemble musical coherent: l'accompagnement polyrythmique.
are instruments in which the sound is made by' the vibration of a stretched membrane or skin, such as barrel and waisted drums, kettledrums, band drums.
The author chose to organize the organology section by first addressing general, historical, and regional studies of Spanish instruments, followed with the organological divisions of aerophones, chordophones, idiophones, and membranophones
Ainsi, les marches dans le feu et les fetes Kali sont accompagnees par un ensemble instrumental homogene, celui de membranophones
xxviii-xxxi), which lists the number of instrument types (aerophones, chordophones, membranophones
, and idiophones) and subtypes found in each of the chronological periods.
Seventy-two instruments are distributed evenly among the four players and grouped by timbral or articulatory characteristics into families: lignophones, for example, claves, wood blocks, castanets, and temple blocks; metallophones, featuring Asian cup bells and Chinese cymbals that impart a distinct oriental flavor; membranophones
, such as bongos, timbales, tom-toms, and bass drums; and instruments capable of multiple articulations, such as snare and parade drums.
The timbre of the third sound-scape derives from membranophones
, including two pairs of timpani, tom-tom, and other members of the drum family.
Although no instruments of definite pitch are included, the composer definitely thinks in melodic terms, if "melodic" can be applied to describe the sounds of unpitched membranophones
The instruments are introduced in subgroups of idiophones, membranophones
, and so forth, and each group is summarized in boxed tables for easy review.
The author then proceeds to describe in great detail a large number of musical instruments, following the logical taxonomy of idiophones, membranophones
, aerophones, and dance.