Pyotr Ilyich Tchaikovsky

Pyotr Ilyich Tchaikovsky (May 7, 1840 - 1893), Russian composer. His works include ten symphonies, the 1812 Overture, the operas Eugene Onegin and The Queen of Spades and the ballets Swan Lake, Sleeping Beauty and Nutcracker.

ok, so how should we spell Tchaikovsky's name? I've seen a few different versions here. What is considered 'correct' transliteration? If/when we reach consensus, the content should be moved to a page with the agreed and the other pages redirect to it.