Swan Lake, Op. 30. 5 Pas de deux - I. Tempo di valse ma non troppo vivo, quasi moderato. I. Tempo di valse ma non troppo vivo, quasi moderato. 20, Act 1: No. Tchaikovsky’s Swan Lake, with its story of magical transformations, love and deceit and its irresistibly melodic score, defines Romantic ballet. 2:26 Listen Now $1.29 12.