Two US Presidents played the piano to a high standard: Harry Truman
|Harry Truman at the Whitehouse (playpiano.com)|
Former Secretary of State Condoleeza Rice performs a piano Brahms quintet for the queen in 2008. Read the Daily Mail's article covering the performance. Her counterpart in the UK William Hague, Foreign Secretary started playing the piano when he stepped down as leader of the conservative party according to this 2003 article in the Guardian: William Hague - the piano years.
Ignace Paderewski, Polish Prime Minister in 1919, and a student of the great teacher Theodor Leschetizky (who also taught Schnabel) performs the Hungarian Rhapsody (clip originates from "The Art of the Piano"). I'm quite familar with one of his legacies - the Paderewski editions of Chopin piano works.
Then there are the hobbyist statesmen - pianists. Here's Vladimir Putin singing and playing Blueberry Hill on the piano.
Perhaps a little more accomplished is Germany's oldest living Chancellor Helmut Schmidt who released a CD of Mozart and Bach Piano Concertos in 2008 coinciding with his 90th birthday.