Conversation so far:
Is Adam's voice special?
Lambert's total recorded vocal range spans from bass E to B flat above tenor high C (E2 - B5), giving him three octaves and six semitones.
Did Adam like to sing as a child?
CANNOTANSWER.
What do people normally say about his voice?
Critics, celebrities and colleagues have been outspoken in their praise for Lambert's vocal command.
Who has his voice been compared to?
Whitney Houston and Aretha Franklin.
Have things have celebrities said about his singing?
Queen guitarist Brian May noted that Lambert's voice has "sensitivity, depth, maturity, and awesome range.
Who else has talked about his voice?
Pharrell Williams.
What did Pharrell say?
This kid has a voice like a siren - there's no guys singing in that Steve Winwood-Peter Cetera range.

Question: Is there anything else important?
Self-contained rewrite: Is there anything else important other than other singer's comments about Adam Lambert's voice?