The lead singer also typically guides the vocal ensemble and band with visual cues to indicate changes of tempo or dynamics, stops or pauses, and the starts of new sections (unless there is also a conductor onstage, as with a big band or unless an instrumentalist bandleader is providing this role). The lead vocalist also typically speaks to the audience between songs, to give information about the songs (such as who wrote them or why it was chosen), introduce the band members, and develop a rapport with the audience. The lead vocalist may also play a leadership role in rehearsals, unless there is a bandleader who takes on this role. If the lead singer is a singer-songwriter, she or he may write some or all of the lyrics or create entire songs (including chords and melodies).