The same year it was released and recorded at Audio Fidelity Records label in New York City. The title may refer to the short staccato or sharp "popping" sound used, or to pop music and its being 'corny', i.e., kitschy. The title is generally written as one word, although some single sleeves (such as the one illustrated) present it as two words, "Pop Corn".

In 1972, Hot Butter's rerecording was a huge hit in many countries. "Popcorn" has since been covered by a great number of artists.

Composer Gershon Kingsley (of Perrey and Kingsley) first recorded it for his 1969 album Music to Moog By. In 1971 the song was re-recorded by Kingsley's band First Moog Quartet. Stan Free, member of the First Moog Quartet, rerecorded the instrumental with his band Hot Butter in 1972. The record was one of a rash of Moog synthesizer-based releases that followed the 1968 Billboard pop Top 40 chart success Wendy Carlos had with Switched-On Bach and that characterized electronic music of the mid-1960s, 1970s and early 1980s.

There were two 7" covers, both released in 1972 under Musicor Records and Stateside labels.

...
Wikipedia