In January 1981, the song "Mr. Frump in the Iron Lung" was recorded. The song, an audience favorite from Yankovic's days playing in coffeehouses at Cal Poly, describes the rather lopsided relationship between the narrator and the eponymous "Mr. Frump" in his iron lung, until the latter's death. The final song, recorded on January 19, 1981, was "Happy Birthday". A morbidly depressing birthday song detailing ails of the world, including poverty, nuclear holocaust, and eventual solar cataclysm, the song is based on the music of artist Tonio K. Only seeing two popular birthday songs at the time—"Happy Birthday to You" by Patty and Mildred J. Hill, and "Birthday" by The Beatles—Yankovic decided to write his own "severely twisted version of one". "Happy Birthday' was recorded in the garage of Richard Bennett, the brother of Schwartz who would go on to be a noted guitarist and record producer. All of the tracks, sans "Another One Rides the Bus" were recorded on a 4-track Portastudio; because only four tracks were available for mixing and recording, Yankovic had to carefully plan which parts of the songs he wanted to record at a time, and then mix them down before adding more song elements.