Months late, but finally arrived: Leonard Bernstein's Norton Lectures. These videotaped spectacles (recorded last year) may well write a new chapter in the long history of the Norton Lectureship. Tickets will probably go quickly, even in the cavernous Harvard Square Theater. This is the first of six lectures which will continue every Tuesday through November 13.

One of the best moments of spring term was emerging from Lowell Lec and the last exam of the year and hearing the Cambridge Brass Ensemble playing from the tower of the Busch-Reisinger Museum. Bring your lunch; the concert begins a little after noon. Strangely enough, the acoustics are slightly better outside the courtyard wall, allowing for occasional drowning out of music by truck traffic on Kirkland Street.

Busch-Reisinger Museum: Cambridge Brass Ensemble perform a Tower Concert. Free. Thursday, October 4, 12:00 noon. Harvard Square Theater: "The Unanswered Question", a Charles Eliot Norton Lecture by Leonard Bernstein. Free. Tickets available 2-9:00 p.m. on the 8th, 2-7 p.m. on the 9th, at the Theater. Tuesday, October 9, 7:30 p.m.

First Church in Cambridge (11 Garden St.): Lionel Rogg, organist, in concert. Tickets: $3 (students: $2). Tuesday, October 9, 8:30 p.m.