Related Clues:

• Bass, e.g.
• Bass, for one
• Warbler
• Sewing machine brand
• Doo-wop group member
• Glee club member
• Musical sounds
• Entertainer
• Vocalist
• Howe rival
• Cabaret performer
• Crooner
• Numbers whiz?
• 32-Across, for one
• One may be backed up