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.
Stage Work with Guitar
Pietro Carlo Niccoli (1787)
Accademia San Felice, Biblioteca Centrale di Firenze, for the 4th centenary of the death of San Filippo Neri
Florence, Italy, Chiesa di San Felice, 26 May 1995: Louise Armand / Lucia Sciannimanico / Gianluca Sorrentino / Enrico Rotoli / Coro e Orchestra dell'Accademia San Felice, Federico Bardazzi (cond.)