“A Fifth of Beethoven” is the title track from Walter Murphy’s 1976 album and can also be found on the Saturday Night Fever soundtrack. The song peaked at #1 on the Billboard Hot 100 and was adapted from Ludwig van Beethoven’s “Symphony Number 5.” The “5th” in Murphy’s version, references a liquid measurement equal to one fifth of a gallon, popular for hard liquor bottles. “A Fifth of Beethoven” was used this year in the limited FX-Hulu show “Mrs. America.”