The standard, accepted order of instrumentation for large ensembles: fl.ob.cl.bsn - hn.tpt.trbn.tba - perc - other - vlnI.vlnII.vla.vlc.db - tape, or electronics. Saxophones appear between clarinet and bassoon.
All other scorings (less than 8 instruments) are listed in full.
When an instrument is listed in parentheses, then this instrument is doubled. "guitar (=electric guitar)" means that the guitarist plays an acoustic, as well as an electric guitar. In an orchestral setting, "1(I=picc).2(II=corA).2(II=bcl).1" would resolve to: 1 flute (also playing piccolo), 2 oboes (second oboe also playing cor anglais), 2 clarinets (second clarinet also playing bass clarinet), 1 bassoon. If there is an extra instrument, which is not doubled, then this is expressly written out, e.g. "1(I=picc).2.corA.2.bcl.1.dbn", which unravels to: 1 flute (also playing piccolo), 2 oboes, 2 clarinets, 1 bass clarinet, 1 bassoon, 1 double bassoon.
Solo instruments in a concerto or chamber setting are written out in front of the ensemble instruments: guitar - 126.96.36.199 - 188.8.131.52 - perc - strgs.
Guitar in the Orchestra
Instituto de Liturgia Música y Arte "Cardenal Miranda", in occasion of its 50th Anniversary
original version: Mexico City, Mexico, Church of Nuestra Señora de Guadalupe, el "Buen Tono", 11 November 1990
revised version: Mexico City, Mexico, Church of Nuestra Señora de Guadalupe, el "Buen Tono", April 2002: Claudia Montiel, soprano / Mario Hoyos, tenor / Benito Navarro, baritone / Pablo Gómez, guitar / Chorus of the Instituto "Cardenal Miranda" / Camerata de las Américas, Juan Trigos (cond.)