Quad (figure skating)
A quad, or quadruple, is a figure skating jump with at least three but less than four revolutions. Most quadruple jumps have 3 1/2 revolutions; the quadruple Axel has 4 1/2 revolutions, although no figure skater to date has completed this jump in competition. The quadruple toe loop and quadruple Salchow are the two most commonly skated in the discipline. Quadruple jumps have become increasingly common among World and Olympic level men's single skaters, to the point that not having one in a program has come to be seen as a severe handicap. The first person to land a ratified quadruple jump in competition was Canadian Kurt Browning in 1988. In 2002, Miki Ando became the first woman to do so, and she remains one of only two women to have landed a ratified quadruple jump in competition.
Jean-Baptiste Singelée
As a longtime friend of Adolphe Sax, the inventor of the saxophone (they met as students at the Royal School of Music), he encouraged Sax to develop the four principal members of the saxophone family, and composed what is very likely the first work ever written for the saxophone quartet, his "Premier Quatuor", Op. 53, completed in 1857. In addition to his saxophone works, Singelée is credited with composing 12 concertos, many solo works for violin and other instruments as well as music for ballet.