G'day Christiano,
http://en.wikipedia.org/w/index.php?title=Giuseppe_Di_Stefano&oldid=1317...
For heaven's sake, you never call someone's voice their instrument. Ever. The terminology is nonsensical. Again, the box just does not fit.
Maybe, maybe not. A couple of other people have talked about the appropriateness of the word "instrument" here; not being musical[0], I'm not qualified to comment.
What I *am* qualified to comment on is http://en.wikipedia.org/w/index.php?title=Giuseppe_Di_Stefano&action=his...
And the little edit war in which you and an IP engaged. Has this become appropriate wikiconduct in this day and age, now?
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[0] "I must be musical. I've got *tons* of CDs!"