Congo Jazz is the second title in the Looney Tunes series starring Bosko. It was distributed by Warner Bros. and The Vitaphone Corporation. It was released as early as July 26, 1930. Congo Jazz was the first cartoon to feature Bosko's falsetto voice that he would use for the bulk of the series' run (the previous Bosko short, Sinkin' in the Bathtub, had used a derisive African-American dialect). It has the earliest instance of a "trombone gobble" in animation.