Guaraldi decided to experiment with combining latin jazz and orchestral instrumentation on his next release, "The Latin Side of Vince Guaraldi" (1964). For the album's orchestrations, Guaraldi turned to Jack Weeks, son of bandleader Anson Weeks, who had previously worked with Guaraldi peers Cal Tjader and Dave Brubeck. This experimentation may have led to the loss of Fred Marshall, who left the group in 1964 citing "personal differences" after Guaraldi purportedly threw a cup of coffee at Marshall during the 17th Berkeley Jazz Festival.