Question:
Hattie McDaniel (June 10, 1895 - October 26, 1952) was an American stage actress, professional singer-songwriter, and comedian. She is best known for her role as "Mammy" in Gone with the Wind (1939), for which she won the Academy Award for Best Supporting Actress, the first Academy Award won by an African American entertainer. In addition to acting in many films, McDaniel was a radio performer and television star; she was the first black woman to sing on radio in the United States. She appeared in over 300 films, although she received screen credits for only 80 or so.
The whereabouts of McDaniel's Oscar are currently unknown. In 1992, Jet magazine reported that Howard University could not find it and alleged that it had disappeared during protests in the 1960s. In 1998, Howard University stated that it could find no written record of the Oscar having arrived at Howard. In 2007, an article in the Huffington Post repeated rumors that the Oscar had been cast into the Potomac River by angry civil rights protesters in the 1960s. The assertion reappeared in the Huffington Post under the same byline in 2009.  In 2010, Mo'Nique, the winner of the Academy Award for Best Supporting Actress, wearing a blue dress and gardenias in her hair, as McDaniel had at the ceremony in 1940, in her acceptance speech thanked McDaniel "for enduring all that she had to so that I would not have to". Her speech revived interest in the whereabouts of McDaniel's plaque. In 2011, J. Freedom duLac reported in the Washington Post that the plaque had disappeared in the 1960s.  In November 2011, W. B. Carter, of the George Washington University Law School, published the results of her year-and-a-half-long investigation into the Oscar's fate. Carter rejected claims that students had stolen the Oscar (and thrown it in the Potomac River) as wild speculation or fabrication that traded on long-perpetuated stereotypes of blacks. She questioned the sourcing of the Huffington Post stories. Instead, she argued that the Oscar was likely returned to Howard University's Channing Pollack Theater Collection between the spring of 1971 and the summer of 1973 or had possibly been boxed and stored in the drama department at that time. The reason for its removal, she argued, was not civil rights unrest but rather efforts to make room for a new generation of black performers. If neither the Oscar nor any paper trail of its ultimate destiny can be found at Howard today, she suggested, inadequate storage or record-keeping in a time of financial constraints and national turbulence may be blamed. She also suggested that a new generation of caretakers may have failed to realize the historic significance of the 5 1/2" x 6" plaque.
Answer this question using a quote from the text above:

how did it disappear?

Answer:
Oscar had been cast into the Potomac River by angry civil rights protesters in the 1960s.

Answer the question at the end by quoting:

Charles-Camille Saint-Saens (French: [SaRl kamij sesas]; 9 October 1835 - 16 December 1921) was a French composer, organist, conductor and pianist of the Romantic era. His best-known works include Introduction and Rondo Capriccioso (1863), the Second Piano Concerto (1868), the First Cello Concerto (1872), Danse macabre (1874), the opera Samson and Delilah (1877), the Third Violin Concerto (1880), the Third ("Organ") Symphony (1886) and The Carnival of the Animals (1886). Saint-Saens was a musical prodigy, making his concert debut at the age of ten.
In the early years of the 20th century, the anonymous author of the article on Saint-Saens in Grove's Dictionary of Music and Musicians wrote:  Saint-Saens is a consummate master of composition, and no one possesses a more profound knowledge than he does of the secrets and resources of the art; but the creative faculty does not keep pace with the technical skill of the workman. His incomparable talent for orchestration enables him to give relief to ideas which would otherwise be crude and mediocre in themselves ... his works are on the one hand not frivolous enough to become popular in the widest sense, nor on the other do they take hold of the public by that sincerity and warmth of feeling which is so convincing.  Although a keen modernist in his youth, Saint-Saens was always deeply aware of the great masters of the past. In a profile of him written to mark his eightieth birthday, the critic D C Parker wrote, "That Saint-Saens knows Rameau ... Bach and Handel, Haydn and Mozart, must be manifest to all who are familiar with his writings. His love for the classical giants and his sympathy with them form, so to speak, the foundation of his art."  Less attracted than some of his French contemporaries to the continuous stream of music popularised by Wagner, Saint-Saens often favoured self-contained melodies. Though they are frequently, in Ratner's phrase, "supple and pliable", more often than not they are constructed in three- or four-bar sections, and the "phrase pattern AABB is characteristic". An occasional tendency to neoclassicism, influenced by his study of French baroque music, is in contrast with the colourful orchestral music more widely identified with him. Grove observes that he makes his effects more by characterful harmony and rhythms than by extravagant scoring. In both of those areas of his craft he was normally content with the familiar. Rhythmically, he inclined to standard double, triple or compound metres (although Grove points to a 5/4 passage in the Piano Trio and another in 7/4 in the Polonaise for two pianos). From his time at the Conservatoire he was a master of counterpoint; contrapuntal passages crop up, seemingly naturally, in many of his works.

Is there anything else that is important regarding his music?
Rhythmically, he inclined to standard double, triple or compound metres