No. There is not a viola.
Handel's fireworks music
"I enjoyed the woodwind quintet recital, but I would have liked to have heard more oboe solos."
Ennio Morricone
The oboe d'amore is in A; the oboe is in C. The oboe d'amore is a minor third lower in pitch than the oboe, however typically music for the oboe d'amore is written so that oboe fingerings may be used (in other words, the note A is printed as a C, so that the player uses the oboe fingering for C but the note sounds a minor third lower).
Band or orchestra music includes oboe parts.
Virginia Snodgrass Gifford has written: 'Music for oboe, oboe d'amore, and English horn' -- subject(s): Bibliography, Catalogs, Chamber music, English horn music, Instrumental music, Library of Congress, Library of Congress. Music Division, Oboe d'amore music, Oboe music
An oboe is an instrument, and a composer writes music. Therefore, no one "composes the oboe," because that is impossible.
to play music?
Whitney Tustin has written: 'Solos for the oboe player' -- subject(s): Arranged Oboe and piano music, Oboe and piano music, Arranged, Scores and parts
The oboe is a musical instrument. Therefore it is used to play classical music.
Geoffrey Burgess has written: 'The oboe' -- subject(s): History, History and criticism, Oboe, Oboe music
No. There is not a viola.
Handel's fireworks music
"I enjoyed the woodwind quintet recital, but I would have liked to have heard more oboe solos."
Ennio Morricone
Louis Debras has written: 'Sequenza 2, for oboe' -- subject(s): Oboe music