Yes, you heard correctly. The Brothers Balliett share a musical oddity — a performing version of Beethoven's 10th symphony in Eb major, completed (compiled?) from sketches by Dr. Barry Cooper. Only a truly audacious musician would dare attempt this task, and the results are well worth a listen.
To set this gemstone, the brothers surround it with other intriguing realizations/remixes/completions: an orchestration of Schumann oboe Romances by Tobias Picker, complete with Picker-esque interludes (no pun intended); a luminous Mahler reduction; and a Haydn string quartet with some wild accordion additions. You can't miss this one.