No, this is not a "band" concert in the modern sense--it is one of the world's leading period instrument ensembles making its Chicago debut at long last. The British Hanover Band (band was a common 18th-century designation for an orchestra) is known primarily in this country through its many award-winning recordings under a variety of names: the Philomusica Antiqua of London, for example, its moniker for its 1985 recording of Beethoven's Third Piano Concerto with soloist Anthony Newman. That recording, the first on period instruments, won the "Record of the Year" award from Stereo Reweiw. Beethoven will be the cornerstone of this concert as well, including his Third Symphony (the Eroica), along with the Mozart Third Violin Concerto and the Haydn Symphony no. 101 (the Clock). One of the interesting features of the Hanover Band is that unlike the more well known Academy of Ancient Music under Christopher Hogwood, or other British early-music groups that employ a "stand-up" conductor (a mid-19th-century development), the group is led primarily through occasional cues from its first violinist. Sunday, 7:30 PM, Orchestra Hall, 220 S. Michigan; 435-6666.