Dear collective trivia wisdom,

Coming out of a performance of the Schumann Piano Quartet (E-flat, Op.
47), yesterday, a friend and I were trying to think of any other
mid-movement retunings in the Romantic chamber literature.  In this case,
the cello retunes the c string down to b-flat during the finale.  Can
anyone think of other similar comparable retunings during a movement in
the Romantic (or Classical) chamber literature?

Thanks and cheers,

Mike Smith
Boulder, Colorado