What defines a symphony orchestra?

A symphony orchestra is defined primarily by its composition and the type of music it performs. It is a large ensemble consisting of various sections, typically including strings, woodwinds, brass, and percussion, which allows for a wide range of musical expression and tone. The orchestra typically performs classical music, which encompasses a broad repertoire including symphonies, concertos, and other forms written for orchestral performance.

This definition distinguishes the symphony orchestra from other musical groups or performances. A solo musical performance involves a single musician or artist, which does not align with the concept of a large and varied ensemble like an orchestra. Additionally, a group performing pop music may include smaller ensembles or bands but would not usually present the orchestral music that a symphony orchestra specializes in. Finally, a collection of vocalists only refers specifically to choral music, lacking the instrumental diversity and structure characteristic of a symphony orchestra. Thus, the essence of a symphony orchestra lies in its size, instrumentation, and focus on classical music, making the first choice the most accurate.