It was originally formed by Amaya Saizar [es], Iñaki de Pablo and Luis Carlos Gil.

In Spanish, the expression literally means clean wheat, figuratively someone who is honest and transparent.

The band represented Televisión Española in the sixth edition of the OTI Festival 1977 with the song "Rómpeme, mátame" getting the fourth place.

Three years later, they represented Spain in the Eurovision Song Contest 1980 with the entry "Quédate esta noche".

By the time of their Eurovision participation, Amaya Saizar had been replaced by Patricia Fernández.