The alto aria is accompanied by an obbligato violoncello piccolo. The alto aria is accompanied by an obbligato oboe. An oboe is the obbligato instrument. In the 1740s version for bass, an oboe da caccia is the obbligato instrument. The inner movements are alternating recitatives and arias for solo singers and mostly obbligato instruments. The Italian style cultivated orchestral masses including soloists, chorus and obbligato instruments. His most notable works were the five "concertos symphoniques", essentially symphonies with piano obbligato. In many arias Bach uses obbligato instruments, which accompany the singer as an equal partner. Likewise, Litolff wrote five "Concertos Symphoniques", also with a piano obbligato. His classical works include two symphonies and a "Rhapsody for Piano, Trumpet obbligato and Orchestra". In this work, he uses instead an obbligato solo organ in several movements. Crosby singled Norman out several times on radio for solo passages which required an obbligato. He blames Ayato for her death and fights the RahXephon with his Dolem Obbligato. These parts were also "obbligato" in the sense of being indispensable. His autobiography, "Obbligato&colon; Notes on a Foreign Service Career", was published in 1984.