Ed Zubrow asks for recommendations on several pieces of CM's  standard
repertoire. Here are my tips:

BEETHOVEN's Piano Sonatas:  Chilean Pianist Alfredo Perl recorded the
whole cycle of Beethoven's Piano Sonatas for the Arte Nova label, but if
you want "the best", you should try the 2 CD set "The Great Piano Sonatas"
(Moonlight, Appassionata, Pathetique, Les Adieux, Waldstein and Pastorale),
Arte Nova 74321 39106 2.  Great performances for a fantastic price.

BACH's Brandenburg Concertos:  Try Raymond Leppard with the English
Chamber Orchestra - 2 CDs from Philips SOLO Series (442 386-2 and 442
387-2).  Bach's two violin concertos and the Concerto for Harpsichord,
Violin, Flute and Strings are coupled.  Also a great bargain.

Wilson Pereira.