The Jazz Singer is a 1927 American musical film. As the first feature-length motion picture with not only a synchronized recorded music score, but also lip-synchronous singing and speech in several isolated sequences, its release heralded the commercial ascendance of sound films and ended the silent film era. Directed by Alan Crosland and produced by Warner Bros. with its Vitaphone sound-on-disc system, the film, featuring six songs performed by Al Jolson, is based on a play of the same name by Samson Raphaelson, adapted from one of his short stories, ''The Day of Atonement''.

Can we conclude that was the jazz singer the first movie with sound?
yes