The Canadian contemporary music company Soundstreams, known for difficult and cerebral works, has mounted a music and theatre production about the life and ideas of admired Quebecois composer Claude Vivier (1948-1983), whose life was rough and tumultuous and whose music was cold, luminous and haunting. The production, titled Musik Für das Ende (which is the name of one of two Vivier pieces performed during the show), is at Toronto’s Crow’s Theatre, a glittering new building in a formerly industrial quarter.