The subcompositions of Electronic Music Nr.20 and Nr.21 by William Slocombe Lennox are being given a lunch time preliminary playing at the Trinity Centre, at the top of Old Market Bristol, U.K., every Thursday between 1 and 2 p.m and Friday afternoon 2.30 to 3.30 p.m.

Use the office entrance at the rear of the buildingif the front and side entrance are closed in cold weather.

Free entrance to informal concerts.