Question: Which animated musical fantasy film originally released by RKO Radio Pictures was the second animated feature film by Disney?

Context paragraphs:
Peter Pan (1953 film): Peter Pan is a 1953 American animated adventure film produced by Walt Disney and based on the play "Peter Pan, or The Boy Who Wouldn't Grow Up" by J. M. Barrie.  It is the 14th Disney animated feature film and was originally released on February 5, 1953, by RKO Radio Pictures.  "Peter Pan" is the final Disney animated feature released through RKO before Walt Disney's founding of his own distribution company, Buena Vista Distribution, later in 1953 after the film was released.  "Peter Pan" is also the final Disney film in which all nine members of Disney's Nine Old Men worked together as directing animators.  It is also the second Disney animated film starring Kathryn Beaumont, Heather Angel, and Bill Thompson after their roles in the animated feature "Alice in Wonderland".

Fun and Fancy Free: Fun and Fancy Free is a 1947 American live-action animated musical fantasy comedy package film produced by Walt Disney and released on September 27, 1947 by RKO Radio Pictures.  It is the 9th Disney animated feature film and the fourth of the package films the studio produced in the 1940s in order to save money during World War II.  The Disney package films of the late 1940s helped finance "Cinderella", and subsequent others, such as "Alice in Wonderland" and "Peter Pan".

Saludos Amigos: Saludos Amigos (Spanish for "Greetings, Friends") is a 1942 American live-action animated package film produced by Walt Disney and released by RKO Radio Pictures.  It is the sixth Disney animated feature film and the first of the six package films produced by Walt Disney Productions in the 1940s.  Set in Latin America, it is made up of four different segments; Donald Duck stars in two of them and Goofy stars in one.  It also features the first appearance of José Carioca, the Brazilian cigar-smoking parrot.  "Saludos Amigos" was popular enough that Walt Disney decided to make another film about Latin America, "The Three Caballeros", to be produced two years later.  "Saludos Amigos" premiered in Rio de Janeiro on August 24, 1942.  It was released in the United States on February 6, 1943.  At 42 minutes, it is Disney's shortest animated feature to date.  It garnered positive reviews and was theatrically reissued in 1949, when it was shown on a double bill with the first reissue of "Dumbo".

List of RKO Pictures films: RKO (Radio-Keith-Orpheum) Pictures (also known as RKO Productions, Radio Pictures, RKO Radio Pictures, RKO Teleradio Pictures and, for a short time, RKO Pathé) is an American film production and distribution company.  The original company produced films from 1929, the year after its inception, through its dissolution in 1959.  RKO is an acronym for "Radio-Keith-Orpheum", created when RCA orchestrated a merge between Film Booking Offices of America (FBO) and Keith-Albee-Orpheum (KAO), and was officially announced on October 23, 1928.  Within two years, the company added Pathé Exchange to the organization, which included the new company's studios in Culver City, its film laboratories in New Jersey, Pathé News, and the company's distribution networks in Europe and the United States.

Pinocchio (1940 film): Pinocchio is a 1940 American animated musical fantasy film produced by Walt Disney Productions and based on the Italian children's novel "The Adventures of Pinocchio" by Carlo Collodi.  It was the second animated feature film produced by Disney, made after the success of "Snow White and the Seven Dwarfs" (1937).

RKO General: RKO General, Inc. was the main holding company through 1991 for the noncore businesses of the General Tire and Rubber Company and, after General Tire's reorganization in the 1980s, GenCorp.  The business was based around the consolidation of its parent company's broadcasting interests, dating to 1943, and the RKO Pictures movie studio General Tire purchased in 1955.  The holding company acquired the name of RKO General in 1959 after General Tire dissolved the film studio.  The original RKO Radio Pictures, Inc. corporation name was then changed to the present day RKO General, Inc.  Current RKO Radio Pictures copyrights are held by this corporate name.  Headquartered in New York City, the company operated six television stations and more than a dozen major radio stations around North America between 1959 and 1991.

Snow White and the Seven Dwarfs (1937 film): Snow White and the Seven Dwarfs is a 1937 American animated musical fantasy film produced by Walt Disney Productions and originally released by RKO Radio Pictures.  Based on the German fairy tale by the Brothers Grimm, it is the first full-length cel animated feature film and the earliest Disney animated feature film.  The story was adapted by storyboard artists Dorothy Ann Blank, Richard Creedon, Merrill De Maris, Otto Englander, Earl Hurd, Dick Rickard, Ted Sears and Webb Smith.  David Hand was the supervising director, while William Cottrell, Wilfred Jackson, Larry Morey, Perce Pearce, and Ben Sharpsteen directed the film's individual sequences.

The Three Caballeros: The Three Caballeros is a 1944 American live-action animated musical package film produced by Walt Disney and released by RKO Radio Pictures.  The film premiered in Mexico City on December 21, 1944.  It was released in the United States on February 3, 1945 and in the UK that March.  The seventh Disney animated feature film, the film plots an adventure through parts of Latin America, combining live-action and animation.  This is the second of the six package films released by Walt Disney Productions in the 1940s, following "Saludos Amigos" (1942).

Society Dog Show: Society Dog Show is a 1939 "Mickey Mouse" cartoon short produced by Walt Disney Productions and released by RKO Radio Pictures.  The animated short was directed by Bill Roberts and animated by Al Eugster, Shamus Culhane, Fred Moore, John Lounsbery, Norm Ferguson, and Leo Salkin.  The film originally released on February 3, 1939.

Cinderella (1950 film): Cinderella is a 1950 American animated musical fantasy film produced by Walt Disney and originally released by RKO Radio Pictures.  Based on the fairy tale "Cinderella" by Charles Perrault, it is the twelfth Disney animated feature film.  Directing credits go to Clyde Geronimi, Hamilton Luske, and Wilfred Jackson.  Songs were written by Mack David, Jerry Livingston, and Al Hoffman.  Songs in the film include "Cinderella", "A Dream is a Wish Your Heart Makes", "Sing Sweet Nightingale", "The Work Song", "Bibbidi-Bobbidi-Boo", and "So This is Love".  It features the voices of Ilene Woods, Eleanor Audley, Verna Felton, Rhoda Williams, James MacDonald, Luis van Rooten, Don Barclay, Mike Douglas, and Lucille Bliss.

Supporting paragraphs: Pinocchio (1940 film) Snow White and the Seven Dwarfs (1937 film)
Answer: Snow White