Jon Gibson (b. 1940) is one of the less frequently mentioned pioneering composers of minimal music and is probably best known as a founding member of the Philip Glass Ensemble. Gibson also holds the unique distinction of having performed with Steve Reich, Terry Riley, and La Monte Young (as a member of the Theatre of Eternal Music), in addition to Glass, the four composers widely regarded as the founding fathers of minimal music. Gibson also has a track record of composing for modern and post-modern dance and Relative Calm (1981) is the fruit of one of his numerous collaborations with well-known choreographers, in this case Lucinda Childs, who commissioned the work. The rediscovery of Relative Calm, one of Gibson's major works, is cause for rejoicing among aficionados of minimalist music.