Chamber music is named after the palace chamber, in which small groups of instruments once performed for the aristocracy. In the Baroque period, chamber music could be played on any variety of instruments, without each instrumental part precisely specified. This became more standardised in Haydn's time, bringing fourth the staple of chamber music: the string quartet and others that followed.
Photo credits: ARCO Chamber Orchestra
Opera combines instrumental music with the dramatic arts in a theatrical setting with diverse paradigms of scope: from solemn opera seria to comical opera buffa, from Peri's Renaissance masterpieces to Strauss's modernism.
Photo: The Marriage of Figaro