The classic lines, the beauty of the wood, the bow, the photogenic nature of it,
not to mention the incredible sounds that it produces.
Here's Rostropovich playing the prelude from Bach's Cello Suite No. 1. You'll recognize it. Beautiful. Amazing. Moving.
Here's Julian Lloyd Webber playing Bach's Air on the G String. Another one you'll recognize. You should see my chill bumps.
Of course, you can't do anything cello without including Yoyo Mah. Here he is playing Paganini's Caprice 24. Insane! Ahh!
How about the rest of you? Any particular instrument that moves you?