For anyone interested in Gilbert and Sullivan Operettas, there is a somewhat unheralded collaboration of Sullivan and Alfred Lord Tennyson called "The Foresters - Robin Hood and Maid Marian". The site is complete with a history of the composition, full lyrics and spoken dialog, music scores, and MIDI song audio. Search the Gilbert and Sullivan Archives or "http://math.boisestate.edu/gas/foresters/operhome.html".
It is not [admitedly] one of Sullivan's best efforts, but interesting!

Ed