Answer:
Violin.
Step-by-step explanation:
"The American Seasons" is a musical album. It was composed by Mark O'Connor, and features three works played by an orchestra, but presents the violin as the solo instrument, giving greater prominence to the violinist. However, the last work is played entirely by the orchestra, without presenting any solo instrument and promoting an equal prominence for the orchestra as a whole, which was conducted by Scott Yoo.