an encore

An encore is an additional performance given by performers at the conclusion of a show or concert, usually in response to extended applause from the audience. They are regarded as the most complimentary kind of applause for performers. Multiple encores are not uncommon, and they initially originated spontaneously, when audiences continued to applaud and demand additional performance from the artists after they had left the stage. However, in modern times they are rarely spontaneous and are usually a pre-planned part of the show.