The UW gets a mention in the Sept-Oct 2006 issue of mental_floss
magazine. There's a piece about school fight songs called "Something Something RAH RAH" that includes the one from my alma mater.
The UW's fight song, "On Wisconsin!" was written by William T. Purdy with lyrics by Carl Beck, 1909. The piece notes that the music was written for a fight song contest at the University of Minnesota. Beck got Purdy to dedicate the song to the UW instead.
Here's something I never noticed: there are a few bars of "On Wisconsin!" in "Be True to Your School" (1963) by The Beach Boys.