From Video Game Music Preservation Foundation Wiki
Bonzo is the song from Jill Goes Underground which plays in the "The Depths Of Heck" (level 9).
Bonzo was composed in AdLib Visual Composer as a ROL file, but was converted to CMF using the program ROL to CMF.
The title comes from the file name, but Dan Froelich explained that the file names were in fact the proper full titles. The file in the game folder is named BONZO.DDT.