Tchaikovsky’s music has given us some of the greatest ballets of all time. Eifman Ballet of St. Petersburg returns to Boston with Boris Eifman’s “Tchaikovsky. Pro et Contra”, a grand artistic ballet exploring the intriguing composer’s life and creative drive. Boris Eifman’s enigmatic contemporary choreography highlights Tchaikovsky’s complicated sexuality and his journey through the creative process. Set to Tchaikovsky’s most popular pieces, the ballet showcases characters from his work who materialize as demons, fairies, and other fantastical characters, pushing and pulling his from torment to the brink of ecstasy.