Mocedades

Mocedades is a Spanish singing group from the Basque Country, who represented Spain in the Eurovision Song Contest in 1973 with the hit song "Eres Tú". It should not be confused with the group El Consorcio, composed of former Mocedades members who left the group and made a career independent from Mocedades, although both groups have been often confused in many countries, especially in South America, where Consorcio is wrongly addressed as "Mocedades" or "previously named Mocedades".

source: Wikipedia