Listen to the first movement of a concerto by Mozart - for example,
Piano Concerto No.23 in A, or Horn Concerto No.3 in E flat.
Listen for, and notice;
(a) the effect made by the 'delayed appearance' of the soloist;
(b) the variety of musical material shared by soloist and orchestra;
(c) the contrast between passages where the soloist is heard alone or
quietly accompanied by the orchestra, and loud orchestral tutti passages
(tutti meaning 'everyone');
(d) sections of musical dialogue between soloist and orchestra;
(e) the musical and dramatic effect of the soloist's cadenza(based on the
themes of the movement) followed by the orchestral coda.

どなたかおねがいします