Answer:

1. Western art music, formal music, serious music, erudite music, or legitimate music.

2. In contrast to most popular styles that adopted the song (strophic) form or a derivation of this form, classical music has been noted for its development of highly sophisticated forms of instrumental music such as the symphony, concerto, fugue, sonata, and mixed vocal and instrumental styles such as opera, cantata.

3. The Classical period was an era of classical music between roughly 1730 and 1820. The Classical period falls between the Baroque and the Romantic periods. Classical music has a lighter, clearer texture than Baroque music and is less complex. ... Instrumental music was considered important by Classical period composers.