Billie Holiday--amateurish heroin-hazed delivery, very limited range (barely an octave)
Glenn Gould--Perfectionist manufactured music; too mechanical for my taste
Diva pop defined entirely by vocal gymnastics rather than singing
Leonard Bernstein--erratic tempos, sometimes so fast the orchestra could barely play it
I never picked up on metal except for Van Halen, and then only when fronted by DLR.
Maria Callas--hard, irritating voice