Listen to Álvarez: Pregária online. Álvarez: Pregária is a Spanish language song and is sung by José Carreras, Wiener Sängerknaben, Chorus Viennensis, Michael G. Gormley, Wiener Symphoniker and Uwe Christian Harrer. Álvarez: Pregária, from the album The Three Tenors At Christmas, was released in the year 2008. The duration of the song is 4:48. Download Spanish songs online from JioSaavn.