In 1978 Congreso along with various other musicians recorded the album ''Misa de los Andes'', which was actually the beginning of the end of the band's first chapter with Fernando Hurtado, Renato Vivaldi and Francisco Sazo quiting the band shortly afterwards.The González brothers (along with flutist Hugo Pirovich) kept the Congreso project alive through live performances, while looking for replacements.Pianist Anibal Correa and bassist Ernesto Holman joined the band around 1979 and later they were surrounded by lyricist and percussionist Joe Vasconcellos.This formation recorded the album ''Viaje por la cresta del mundo'' (1981, EMI) and what's really impressive about this work is that period sounds have not touched the band at even the slightest deegree.They insisted on playing elaborate Prog-inclined Folk Rock with traditional strings and wind instruments, complemeted by soft electric guitars and elaborate piano parts, while the vocals are always ethereal.Even better, this work present some of Congreso's most complex compositions with a mood for long instrumental parts and innovative interplays.Parts of the album remind me of Gentle Giant, driven by huge interplays between strings, piano and flute, fronted by measured but efficient grooves and showered by more expressive vocals, which leave behind much of the romantic spirit of the softer tracks.