Music Appreciation homework

The meaning of the term concerto has changed at least three times in the history of music. What are the major elements of the concerto? Is there always a soloist? Is there a traditional musical form? Refer to the listening examples in the Special Focus (Concertos) to support your conclusions.

Listening Example:

The Four Seasons, First Movement, "Spring" by Vivaldi

Trumpet Concerto in E-Flat Major, Third Movement by Haydn

 Piano Concerto No. 23 in A Major by Mozart