Sergio y Estíbaliz were a Spanish vocal duo , formed by Sergio Blanco Rivas ( 17 November 1948 – 15 February 2015 ) and Estíbaliz Uranga Amézaga ( 9 December 1952 ) who also worked with groups Mocedades and El Consorcio . They were also known for their participation in the Eurovision Song Contest 1975 . Both were born in Bilbao
Eurovision Song Contest 1975
Eurovision Song Contest 1975
Sergio y Estíbaliz