The Queen of the night aria from Mozart's 'The Marriage of Figaro' opera is a challenging aria for a soprano.

Edward Harper has written:

'The Peddler's Trade'

'The Ariadne Thread'

'Fantasia IV, for Violin, Piano, and Chamber Orchestra (Oxford Contemporary Music)'

Michel Perrault has written:

'[ Orchestral and chamber music, and Esquisses en plein air, for soprano or contralto, string orchestra and harpsichord' -- subject(s): Scores, Orchestral music, Songs (High voice) with string orchestra, Chamber music

A chamber orchestra.

Sinfonietta

It is synonymous. Chamber music is the music that is played by a Chamber orchestra.