In 1960, Johnny Pacheco's first orchestra had signed with Alegre Records and their first album titled “Johnny Pacheco y Su Charanga” sold over 100,000 copies within the first year and was the biggest selling album in Latin music history up to that point.
In 1961, Al Santiago created the Alegre All Stars (also spelled Alegre All-Stars), remembering the well-known Cuban Jam Sessions ("Descargas Cubanas") in the 1950s on the Panart Records label. Johnny Pacheco got his friend, the trombonist Barry Rogers, to play with the Alegre All-Stars which featured a unique instrumentation of flute, tenor sax, and trombone. Fred Weinberg was Santiago's and the labels favorite sound engineer who also recorded many of the artists individually.
Washburne, Christopher, Sounding Salsa: performing Latin music in New York City, Temple University Press, June 28, 2008. ISBN978-1-59213-315-4. Cf. pp. 17, 19.
The House That Al Built: The Alegre Records Story 1957-1977, 2-CD Set CD (Fania / Emusica - Remastered Edition 130 315), Released 2008
Boggs, Vernon W., "Salsiology: Afro-Cuban music and the evolution of salsa in New York City", New York : Greenwood Press, 1992. ISBN0-313-28468-7