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.

Question: Who has his voice been compared to?
Self-contained rewrite: Who has Adam Lambert's voice been compared to?