By 1973, Columbia/CBS Records had received a considerable number of requests for Carlos to produce another album of synthesized classical music. She agreed to the request, opting to produce a sequel to "Switched-On Bach", which began with her and Elkind seeking compositions that were most suitable for the synthesizer; the two picked selections from Suite No. 2 in B minor, Two-Part Inventions in A minor and major, Suite from Notebook for Anna Magdalena Bach, and Brandenburg Concerto No. 5 in D major. The latter features a Yamaha E-5 Electone organ for certain passages, as a reliable polyphonic keyboard had not been developed. The result, "Switched-On Bach II", was released in 1973 and sold over 70,000 copies in the US during the first five weeks of its release.