Any by or for Víctor Jara: https://es.wikipedia.org/wiki/Anexo:Obras_musicales_relacionadas_con_V%C3%ADctor_Jara
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“A Salvador Allende”, by Mexican songwriter and singer Óscar Chávez.
El Pueblo Unido Jamas Sera Vencido
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Carlos Puebla - Elegía a Salvador Allende
El Pueblo Unido was common around that time
I think it predates the fall, but Victor Jara's El Derecho de Vivir en Paz.
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