The leader is the principal musician in the 1st violin section and is the head of the orchestra within the orchestra. When entering the hall, the leader acknowledges the audience on behalf of the orchestra. The leader watches the conductor for the tempo, leads the 1st violins and keeps the orchestra together. The leader works with the other section leaders, or principals, and if there are any violin solos in the work being performed, the leader plays them. Leaders have to be competent soloists as well as sensitive ensemble players.