Sanding (dance) the box of rosin before matches to improve his grip. Sims' popularity as a tap dancer and career at the Apollo certainly made him one of the most if not the most influential sand-dancer of all time. Sand dancing was also used by the popular comedic vaudeville trio, Wilson, Keppel and Betty. They spread sand over the stage in one of their most well-known numbers, "Sand Dance". In their performance, there was no allusion to African American heritage; rather to the sandy environs of Egypt, a clear inspiration for their number. In spite of this deviation from the African American
20th-century music Hymns and Spirituals, Minstrel music and work songs. Mostly instrumental pieces creating sounds of a soothing, romantic, mood-elevating or generally relaxing nature. Steven Halpern's "Spectrum Suite", released in 1975, is generally credited as the album that began the new-age music movement. The polka, which first appeared in Prague in 1837, continued to be a popular form of dance music through the 20th century, especially in Czechoslovakia, Poland, and areas of the United States with a large population of central-European descent. A particularly well-known 20th-century example is Jaromír Vejvoda’s "Modřanská polka" (1927), which became popular during World War II in Czechoslovakia