Congo Jazz

Congo Jazz is a Looney Tunes cartoon starring Warner Bros.' first cartoon star, Bosko.[1] The cartoon was released on August 9, 1930.[2] It was distributed by Warner Bros.

And The Vitaphone Corporation.

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.