The Knoxville Symphony Orchestra wrapped up its 2024-25 Chamber Classics season at the Bijou Theatre on Sunday in rather spectacular fashion. The concert was sold out, proving not only that Antonio Vivaldi’s Four Seasons is intensely popular with audiences, but also that the series itself is attractive to those who gravitate to a Sunday afternoon performance in the intimate acoustic environment of the Bijou. Gratifying, too, is the fact that the series uses its own orchestra members as soloists, something that often leads to truly compelling performances from musicians getting a turn in the spotlight.