Can You Identify The Singers on These Seven Clips?

This is a new feature in which seven snippets from assorted opera singers' recordings will be offered (below). After you've listened to the snippet, visit our "Mystery Singer" thread on our Mario Lanza forum and post your guess. (Non-members will need a Google ID to participate.)

Have fun!

Here is Mystery Singer #1. Good luck!

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And here is Mystery Singer #2. 

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Mystery Singer #3! Hint: This is a live performance from 1988.

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Mystery Singer #4! Who is this mysterious tenor singing "Vesti la giubba"?

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Mystery Singer #5!

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Mystery Singer #6...

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And finally: Mystery Singer #7 (I've saved the most difficult till last, I suspect!)