Lead vocalists typically incorporate some movement or gestures into their performance, and some may participate in dance routines during the show, particularly in pop music.
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).
Examples of a lead vocalist in rock music are Freddie Mercury from Queen and Mick Jagger from the Rolling Stones.
[1] The practice of using a lead singer in vocal groups, however, has a longer history: an early form is the "call and response" found in work songs and spirituals sung by African-American slaves.
Songs of the late nineteenth century frequently used a leading solo voice (or "call"), followed by a choral response by other singers.
By the 1950s, singers such as Sam Cooke (with the Soul Stirrers) and Clyde McPhatter (with the Drifters) took on more clearly defined roles as lead singers, and by the end of the decade credited group names often changed to reflect the leading roles of the main vocalists, with examples such as Frankie Lymon & the Teenagers and Dion & the Belmonts.