The Chamber Orchestra of Philadelphia doesn't end its season with a bang, but with the sort of alternative mandate in which Mozart's less-often-played Symphony No. 29 is an appropriate grand finale.
Other conductors might have questioned that at Monday's concert in the Kimmel Center's Perelman Theater: The 18-year-old Mozart was turning out consistently pleasant music at that time, but not mature masterpieces. Still, music director Dirk Brossé told the audience that it rates high among his favorites, so one had to trust that he hears something others miss. And he does.
Though often regarded as hailing from an elegant, purposely lightweight musical era that Mozart was soon to transcend, the Symphony No. 29 was a piece that the aging legend Herbert von Karajan maintained in his late-in-life touring programs, and he gave it a weight that bordered on ponderous.