What is "rockaby"

Rockaby is a short one-woman play by Samuel Beckett. It was written in English in 1980, at the request of Daniel Labeille, who produced it on behalf of Programs in the Arts, State University of New York, for a festival and symposium in commemoration of Beckett's 75th birthday. The play premiered on April 8, 1981 at the State University of New York at Buffalo, starring Billie Whitelaw and directed by Alan Schneider. A documentary film, Rockaby, by D. A. Pennebaker and Chris Hegedus records the rehearsal process and the first performance. This production went on to be performed at the Annex at La MaMa Experimental Theatre Club, and, in December 1982, at the Cottesloe, Royal National Theatre, London.