Here denotational always attracts the extensional meaning in the pair, but the other element genuinely varies. See intension for some more discussion.
... 1983 Glenn Gould 1986 Gordon Lightfoot 1987 The Guess Who[?] 1989 The Band 1990 Maureen Forrester[?] 1991 Leonard Cohen 1992 Ian and Sylvia[?] 1993 Anne ...