Further Corrigenda to The Harvard Dictionary of Music

So says Paul Bailey:

a cadenza is kind of like the circus train stopping in your neighborhood, either the elephants will do something cool or just crap on the side of the tracks.

Addendum (19/06) : The Lattice of Coincidence intervenes to confirm this definition: conductor Kenneth Woods discusses the -- by tradition, not by score -- practice of interpolating a cadenza into the first movment of the Schumann Cello Concerto.