A soulful and affecting offering is in store this weekend, starting with Lutosławski’s Funeral Music, which he wrote to celebrate the composer who had been an important influence on his own career. Also, pianist Jean-Efflam Bavouzet, whose playing of Bartók’s final work, the carefree and exceptionally lovely Third Concerto, has been called “pure, unaffected delight all the way through” (San Francisco Chronicle) makes his CSO debut. The program concludes with Beethoven’s Symphony No. 2, a surprisingly carefree and innocently sunny work considering that he composed it while facing the inevitability that he was going deaf. Immediately before each performance of the Symphony, a member of Ensemble Theatre will read Beethoven’s “Heiligenstadt Testament,” in which the composer expresses his profound inner struggles with his deafness.