Mellotronists

I am entirely new to the Mellotron, though I must have heard it 
somewhere w/o knowing it, so I was wondering if anyone could tell me 
what a mellotron sounds like, and share some examples of music that 
features the 'tron.  
     I've been reciently intrigued by it thanks to an old article I 
read about Dan the Automator, the underground Hip-Hop producer.  I'd 
appreciate any insight if it's not a bother.

XANDRE