Often planned, sometimes spontaneous events which may occur in an art gallery but can take place anywhere. Performances often involve the activity spectators as well as artists. While the performance may be recorded, the aim is typically the event rather than any product or commodity that can be sold. Happening was the name used for performances of the fluxus group in the early 1960s, but performances as art date back at least as far as the cabaret voltaire of the dada movement in the period just following the first world war. Key figures include joseph beuys, john cage (a musician), vito acconci, yoko ono, and laurie anderson.