Inti-illimani were a group formed in Chile in 1967 by a group of university students. It acquired widespread popularity in Chile for their song Venceremos (We shall win!) which became the anthem of the Popular Unity government of Salvador Allende.
The group was performing in Europe at the time of the coup in September, 1973. They could not return to Chile, so they lived in exile in Italy.

Here's a YouTube Playlist to introduce you to their music.

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Threads: Inti-Illimani