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"Duos" is a collection of some of legendary French singer Charles Aznavour`s greatest songs, recorded as duets with some of the biggest stars of the French and international stage, including Elton John, Josh Groban, Edith Piaf, Frank Sinatra, Sting, Paul Anka, Céline Dion, Placido Domingo, Bryan Ferry, Herbert Grönemeyer, Johnny Hallyday, Julio Iglesias, Carole King, Dean Martin, Liza Minnelli, Nana Mouskouri and Laura Pausini.  Aside from the Frank Sinatra and Dean Martin (virtual) duets, every one of these tracks was written and/or composed by Charles Aznavour, and crucially has never been released before.  They were recorded over the years, but never heard outside of the immediate circle of those involved, making "Duos" a stunning piece of music recording history.