Cellist Amanda Forsyth joined Zukerman in a very fine reading of the Double Concerto. Even more than her partner, Ms. Forsyth displayed a marvelous air of spontaneity, seeming to inhabit the music as she played it. Together, they put their considerable chamber-music experience to great use in Brahms’ final orchestral work. The playing showed a wide range of color, not only from the two soloists, but also from the orchestra.