"Popcorn" is influential electronic instrumental song, composed by Gershon Kingsley in 1969 and first appearing on his album Music to Moog By. In 1972, Hot Butter's rerecording was a huge hit in many countries. That version is by far the best known, even more than the original.

See also the piano version: https://easypiano.cz/sheetmusic/278/popcorn-advanced-version