This is a rare rock song with a marimba (heavily damped) as the lead instrument. At the time, many people brewed coffee at home using percolators, which were pots that cycled the boiling water through the coffee grounds. They would often make little chiming sounds as they percolated, so Maxwell House created a commercial
(Perky!) where the percolator played a jingle as it brewed the coffee. This jingle was the basis for the song, which emulated it with the marimba.