"High School Cadets" is a march that was written in 1890 by John Philip Sousa. The march is written in the form IAABBCCDD.
The tune is often included on compilations of Sousa's works. The final portion of the song (one apiece of the 'C' and 'D' segments) was used for the melody of "The March of the Penguins" in Gloria Jean's 1939 film, The Under-Pup. Gloria Jean also sang the song as a solo in the follow-up film, A Little Bit of Heaven. It is also part of "Sousa Times Twosa".