Zinka Milanov sings Norma: Sediziose Voci ... Casta Diva. LIVE

Though typically not affiliated with belcanto repertoire, I consider Milanov one of the greatest performer of Norma in the 20th century. She made her debut as Norma in 1935 at age of 28. My top 5 list would be: 1. Callas 2. Ponselle 3. Caballe 4. Milanov 5. Cigna