On April 15, 1923, at the New York City's Rivoli Theater took place the first commercial screening of motion pictures with sound-on-film, which would become the future standard. It consisted of a set of short films varying in length and featuring some of the most popular stars of the 1920s (including Eddie Cantor, Harry Richman, Sophie Tucker, and George Jessel among others) doing stage performances such as vaudevilles, musical acts, and speeches which accompanied the screening of the silent feature film "Bella Donna". All of them were presented under the banner of De Forest Phonofilms. The set included the 11-minute short film "From far Seville" starring Concha Piquer. In 2010, a copy of the tape was found in the U.S. Library of Congress, where it is currently preserved. Critics attending the event praised the novelty but not the sound quality which received negative reviews in general. That June, De Forest entered into an extended legal battle with an employee, Freeman Harrison Owens, for title to one of the crucial Phonofilm patents. Although De Forest ultimately won the case in the courts, Owens is today recognized as a central innovator in the field. The following year, De Forest's studio released the first commercial dramatic film shot as a talking picture—the two-reeler "Love's Old Sweet Song", directed by J. Searle Dawley and featuring Una Merkel. However, phonofilm's stock in trade was not original dramas but celebrity documentaries, popular music acts, and comedy performances. President Calvin Coolidge, opera singer Abbie Mitchell, and vaudeville stars such as Phil Baker, Ben Bernie, Eddie Cantor and Oscar Levant appeared in the firm's pictures. Hollywood remained suspicious, even fearful, of the new technology. As "Photoplay" editor James Quirk put it in March 1924, "Talking pictures are perfected, says Dr. Lee De Forest. "So" is castor oil." De Forest's process continued to be used through 1927 in the United States for dozens of short Phonofilms; in the UK it was employed a few years longer for both shorts and features by British Sound Film Productions, a subsidiary of British Talking Pictures, which purchased the primary Phonofilm assets. By the end of 1930, the Phonofilm business would be liquidated.