The piece Cielo Gris (Grey Sky), by the Catalan virtuoso Josep Cervera Bret, was completed on January 16, 1960 in Roses, the town where he established his residence. It is believed that this was the last piece he composed, and that it was transcribed for violin at the request of a musician who heard it rehearsing it at home. In the original manuscript the piece is described as a "romance", it requires using the position of the thumb in a creative and expressive way at all times.
 
After having contributed to discovering and recovering the 60 pieces that Cervera left at his family residence, Leon Bosch, offers this edition for the first time for interpretation through this edition under the seal of "I Musicanti Publishing".