The recorded the classic song "La Muerte de mi Hermano" as part of their 1967 album Kaleidescope Men.

The group began in 1962 in the district of Playa Ancha in Valparaiso, as a rock cover band, coming to the attention of national radio stations.

After playing at festivals and universities in Valparaiso, the band moved to Santiago, where they met the talented drummer Eric Franklin and later the composer and singer Willy Morales, who shared the same musical interests .

RCA supported the 1966 album Go Go/22, Los Mac's' first LP, with shades of The Beatles, the Rolling Stones, the Kinks, The Shadows and Bob Dylan, with Willy Morales taking such influences in his own direction.

The Mac's were strongly influenced by the Beatles' Sgt Pepper's Lonely Hearts Club Band, which led them to experiment with psychedelic sounds, recording the album Kaleidoscope Men in late 1967.