Igor' Yefimovich Rogalyov (born in 1948) is ranked among the galaxy of the Petersburgian composers. Different kinds of operas; symphonic, string and chamber scores; vocal cycles, concertos so as choral large-scaled cantatas and oratorios belong to this fruitful author. Rogalyov also hits marks in the sphere of theatre and cinema music. The tango for two piano "Piazzolla ma non troppo" ("Piazzolla but not too Much") dates 2002. Its first version which is left unpublished was intended for piano solo. Later there were created the other two versions. The one for cello and piano was represented by the Petersburgian cellist Sergei Roldugin and the author himself in 2002. The version for two pianos saw the world at the Athens International Pianists' Competition "Concerteum" in 2002. It was the "Petroduet" to have performed it there. The first syllables of its members' surnames â?? Dmitri Petrov and Anastasia Rogalyova form this duet's name.