00:00 - First tenor (1937) 00:53 - Second tenor (1937) 01:30 - Third tenor (1950) 02:00 - Fourth tenor (1956) 02:30 - Fifth tenor (1940')
1. F. Merli (the first Calaf on record, as far as I know) 2. G. Martinelli (unmistakable!) 3. B. Gigli (very easy to recognize) 4. Mario Filippeschi (his trademark crescendo) 5. G. Lauri-Volpi (you can't mess up with that one)