In linguistics, and particularly in morphology, lemma refers to the canonical form of the word. This is important mainly in the highly flexible languages[?], such as Czech.
... 1991 Leonard Cohen 1992 Ian and Sylvia[?] 1993 Anne Murray 1994 Rush 1995 Buffy Sainte-Marie[?] 1996 David Clayton-Thomas[?] 1996 Denny Doherty[?] 1996 ...