• http://www.biography.com/people/pyotr-ilyich-tchaikovsky-9503375#awesm=~oBC0sBtV8bFTCm
• http://www.pbs.org/wnet/gperf/education/tchaikovsky.html
• http://www.mirror.co.uk/news/uk-news/tchaikovsky-top-10-things-you-790613#ixzz2z49jHAOe
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