Impossible rare album by Chilean beat pioneers The Mac's, recorded in 1967 under the influence of the British Invasion sound, including covers of the Rolling Stones, Dylan, the Hollies and the outstanding original "Que Clase de Sentimiento". First time vinyl reissue. Second album by Chilean beat pioneers Los Mac's, originally released in 1967 on RCA Victor. This record features such a unique sound that made them stand out in the local scene and has become a milestone in the development of popular music in Chile. Recorded under the influence of the British Invasion sound, this album includes covers of the Rolling Stones, Dylan, the Hollies and the outstanding original 'Que Clase de Sentimiento'. "GG Session" anticipated the band's new sound, fully achieved in their next album "Kaleidoscope Men".