The Castle Lager Big Band was formed after the 1963 Moroka-Jabavu Jazz Festival. This 17-piece group made the album "Jazz: The African Sound", which had six tracks, two compositions by Abdullah Ibrahim, two by Kippie Moeketsi and two by McGregor, all in arrangements by McGregor. Apart from the arrangements, one of the most striking things about the album was the wonderful playing by Moeketsi on clarinet, instead of his usual alto. In the band were musicians who had yet to make names for themselves but would become internationally known. Most notable perhaps was Barney Rachabane, who would go on to, among other achievements, play with Paul Simon on the Graceland tour. Simon would describe Rachabane as the "most soulful sax player in the world".