BOSTON (AP) — Thousands of revelers will descend on Boston for the annual Boston Pops Orchestra concert and fireworks display.

The famed July 4th show, now in its 42nd year, takes place Saturday night at the Esplanade, followed by a fireworks display on the Charles River.

Boston Pops conductor Keith Lockhart, in his 20th year leading the televised event, will be joined by Broadway performer Michael Cavanaugh, American Idol finalist Melinda Doolittle, Boston-based quartet the Sons of Serendip, the Boston Crusaders drum and bugle corps, gospel singer and The Voice contestant Michelle Brooks-Thompson and the USO Show Troupe.

The event also includes a "Pick the Pops Playlist" where viewers can choose some of the songs performed during the concert.

A live webcast of the event starts 8 p.m. at www.bostonpopsjuly4th.org/