Page 66 of James Pritchett's "The Music of John Cage" lists the first performance, at least, as being im early 1951. On Thu, Apr 30, 2009 at 8:49 PM, Margaret Leng Tan <margaretlengtan@earthlink.net> wrote: > > Does anyone know the date for the Lecture on Something? Is it 1949, 50 or > 51?