The interesting British pianist Charles Owen makes his New York recital debut at the Frick Collection. On the program are Mendelssohn's "Variations S�rieuses," Bach's Partita No. 4 and the first book of Debussy's Pr�ludes. It's not all familiar stuff, though: two works by Nico Muhly, "Short Stuff" and "Hudson Cycle," preface the Debussy.