Billie Holiday, Mary Ford, Peggy Lee, Dusty Springfield, Linda Thompson, Laura Nyro, The Roches, Nancy Griffith, Joan Armatrading, Bonnie Raitt, eva Cassidy, Mcgarrigle sisters, Ani Difranco, Etta James, Patty Griffin, Jane siberry, Loreena Mckeena,Jennifer Warnes, Aimee Mann, Joni Mitchell, Dolly Pardon, emmylou Harris, Cassandra Wilson, Patti Smith, Siouxie Sioux, Janis Joplin-and, sigh, there are more.They are all great, but not always great.I could not pick one as the best because they have each in their own way brought something different to music- some with their writing-some with their presense and style-phrasing, and others for their incredible vocal range.