Question: Rachel Elkind produced the 1968 album "Switched-On Bach" for what American composer best for her electonic music and film scores?

Context articles: Switched-On Bach II
Switched-On Bach
Rachel Elkind-Tourre
Wendy Carlos
Pierluigi Giombini
Alex North
The Well-Tempered Synthesizer
Christopher Gordon (composer)
Switched-On Rock
Switched-On Brandenburgs

Switched-On Bach II is a musical album by Wendy Carlos, produced by Carlos and Rachel Elkind and released in 1973.
Switched-On Bach is the first studio album by the American musician and composer Wendy Carlos, released under her birth name Walter Carlos in October 1968 by Columbia Records.
 Produced by Carlos and Rachel Elkind, the album is a collection of pieces by Johann Sebastian Bach performed by Carlos and Benjamin Folkman on a Moog synthesizer.
 It played a key role in bringing synthesizers to popular music, which had until then been mostly used in experimental music.
Rachel Elkind (born February 23, 1939) is an American classical musician, producer and composer.
 She produced the work of Wendy Carlos, most notably the bestselling 1968 album "Switched-On Bach".
Wendy Carlos (born Walter Carlos; November 14, 1939) is an American musician and composer best known for her electronic music and film scores.
 Born and raised in Rhode Island, Carlos studied physics and music at Brown University before moving to New York City in 1962 to study music composition at Columbia University.
 Studying and working with various electronic musicians and technicians at the city's Columbia-Princeton Electronic Music Center, she oversaw the development of the Moog synthesizer, then a relatively new and unknown keyboard instrument designed by Robert Moog.
Pierluigi Giombini (born 11 December 1956 in Rome) is an Italian songwriter and record producer.
 He was born in a family of musicians: his father Marcello Giombini was a composer of secular music and film music as well as being interested in electronic music.
 His grandfather was a music professor who specialized in the oboe and also played in orchestras. Giombini therefore had been introduced at an early age to the classics and progressed to study piano and composition at the conservatory.
 While he was studying classical music at the Conservatory in Rome, he also listened to 1970s progressive rock groups; Emerson, Lake & Palmer in particular and Wendy Carlos.
 It was Wendy Carlos' "Switched-On Bach" records that inspired him to study and create the synth sounds that he later used on his hit records in the 1980s.
 Even now he still uses hardware and software synths for his current projects such as 'Web'.
Alex North (December 4, 1910 – September 8, 1991) was an American composer best known for his many film scores, including "A Streetcar Named Desire" (one of the first jazz-based film scores), "Viva Zapata!
", "Spartacus", "Cleopatra", and "Who's Afraid of Virginia Woolf?
".
 He was the first composer to receive an Honorary Academy Award but never won a competitive Oscar despite fifteen nominations.
The Well-Tempered Synthesizer is the second studio album from the American musician and composer Wendy Carlos, originally released under her birth name, Walter Carlos, in November 1969 on Columbia Masterworks Records.
 Following the success of her previous album, "Switched-On Bach" (1968), Carlos proceeded to record a second album of classical music performed on a modular Moog synthesizer from multiple composers, including Johann Sebastian Bach, Claudio Monteverdi, Domenico Scarlatti, and George Frideric Handel.
 Its title is a play on words from Bach's set of preludes and fugues named "The Well-Tempered Clavier".
Christopher Gordon is an English born Australian composer best known for his film scores, but has also received major classical commissions.
 Major film scores include "Mao's Last Dancer", "Master and Commander" and "On the Beach".
Switched-On Rock is an album of instrumental cover songs, popular songs from the mid-to-late-1960s, performed on the Moog modular synthesizer in an exaggerated electronic style.
 It was one of a spate of albums which capitalized on the success of 1968's "Switched-On Bach" by Wendy Carlos.
 "Switched-On Rock" was produced by Norman Dolph who also wrote the liner notes.
 Dolph worked in the studio with colleagues Kenny Ascher and Alan Foust; they billed themselves as the Moog Machine for this and one more project.
 The album reached number 170 on the Billboard Top 200.
Switched-On Brandenburgs is a 1979 double album by Wendy Carlos.
 It was the seventh album released by Carlos, and the fourth album in her project of classical music which also included "Switched-On Bach" (1968), "The Well-Tempered Synthesizer" (1969), "Switched-On Bach II" (1974), and "Switched-On Bach 2000" (1992).