Celebrating Mendelssohn’s Birthday with Piano Recordings   February 3rd is Felix Mendelssohn’s birthday. To celebrate, here are two reviews of recent recordings of piano music by the composer. Felix Mendelssohn Complete Music for Solo Piano, Vol. 6 Hyperion CD Howard Shelley   Pianist Howard Shelley has been making his way through the compendious catalog of Felix Mendelssohn. The latest entry in his complete set, Volume Six, contains several well-known favorites as well as gems without opus numbers. If one has the impression of Mendelssohn as a neo-Mozartean composer of grace without the oomph of a creator like Schumann from the