<span>Concerto grosso is a three-movement work orchestra with a group of featured instruments/players as opposed to concerto (solo concerto).
</span><span> This form of </span>baroque music consists of small group of soloists (the concertino) and full orchestra. The solo concerto on the other hand includes <span>a single solo instrument with the melody line and an orchestra. </span>
It's harmony because of the complementary colors and the way the figures are proportioned in the piece.
