Promenade concerts are an annual festival of classical music concerts held at London's Royal Albert Hall from mid-July until mid-September. The British Broadcasting Corporation (BBC) organizes and promotes the concerts, which are usually called the BBC Proms. The programs include chamber music, opera, and orchestral and choral works. The BBC's chief house orchestra, the BBC Symphony Orchestra, performs about six of the concerts, with other BBC orchestras and ensembles performing a few others. Many other orchestras, ensembles, and soloists from around the world also perform.