Meanwhile, Warner Bros. had released three more talkies, all profitable, if not at the level of "The Jazz Singer": In March, "Tenderloin" appeared; it was billed by Warners as the first feature in which characters spoke their parts, though only 15 of its 88 minutes had dialogue. "Glorious Betsy" followed in April, and "The Lion and the Mouse" (31 minutes of dialogue) in May. On July 6, 1928, the first all-talking feature, "Lights of New York", premiered. The film cost Warner Bros. only $23,000 to produce, but grossed $1.252 million, a record rate of return surpassing 5,000%. In September, the studio released another Al Jolson part-talking picture, "The Singing Fool", which more than doubled "The Jazz Singer"'s earnings record for a Warners movie. This second Jolson screen smash demonstrated the movie musical's ability to turn a song into a national hit: inside of nine months, the Jolson number "Sonny Boy" had racked up 2 million record and 1.25 million sheet music sales. September 1928 also saw the release of Paul Terry's "Dinner Time", among the first animated cartoons produced with synchronized sound. Soon after he saw it, Walt Disney released his first sound picture, the Mickey Mouse short "Steamboat Willie".