Met villains, often

• They perform "Asleep in the Deep"
• Players of Fiorello and Dr. Bartolo in "The Barber of Seville"
• Choir section
• Some operatic voices
• Ezio Pinza et al
• Some singing villains
• Deep opera voices
• Low voices
• Chaliapin et al

Wiktionary Word definitions in Wiktionary
n. (plural of basso English)