Joshua Rifkin (born April 22, 1944 in New York) is an American conductor, keyboard player, and musicologist, and is currently a Professor of Music at Boston University.As a performer he has recorded music by composers from Antoine Busnois to Silvestre Revueltas, and as a scholar has published research on composers from the Renaissance to the 20th century. He is famed among classical musicians and aficionados for his increasingly influential theory that most of Bach's choral works were sung with only one singer per choral line. Rifkin argued: "So long as we define 'chorus' in the conventional modern sense, then Bach's chorus, with few exceptions, simply did not exist." He is best known by the general public, however, for having played a central role in the ragtime revival in the 1970s, with the three albums he recorded of Scott Joplin's works for Nonesuch Records. 　　Rifkin's Joplin albums (the first of which was Scott Joplin: Piano Rags in November 1970 on the classical label Nonesuch)—which were presented as classical music recordings—were critically acclaimed, commercially successful and led to other artists exploring the ragtime genre. It sold 100,000 copies in its first year and eventually became Nonesuch's first million-selling record. The Billboard "Best-Selling Classical LPs" chart for 28 September 1974 has the record at No. 5, with the follow-up "Volume 2" at No. 4, and a combined set of both volumes at No. 3. Separately both volumes had been on the chart for 64 weeks.The album was nominated in 1971 for two Grammy Award categories: Best Album Notes and Best Instrumental Soloist Performance (without orchestra), but at the ceremony on March 14, 1972, Rifkin did not win in any category. Rifkin's work as a revivalist of Joplin's work immediately preceded the adaptation of Joplin's music by Marvin Hamlisch for the film The Sting (1973). In 1979 Alan Rich in the New York Magazine wrote that by giving artists like Rifkin the opportunity to put Joplin's music on record Nonesuch Records "created, almost alone, the Scott Joplin revival." 　　In August, 1990, Rifkin recorded a CD for the Decca label (catalog number 425 225) featuring rags by two of the other major composers of ragtime, Joseph Lamb and James Scott, and also tango compositions by the Brazilian composer Ernesto Nazareth.