The Fort Worth Symphony Orchestra’s own music director, Robert Spano, is also an accomplished pianist. In this first chamber concert of the season, another star pianist, Peter Takács, joins Spano in a duet by Schubert, the Fantasie in F minor. Takács goes on solo with a pair of works by Haydn, the Variations in F minor and the Fantasy in C Major, before nine other FWSO players take the Kimbell stage for Louis Spohr’s elegant Nonet.