At the 14th Warsaw Autumn International Festival of Contemporary Music on 20 September 1970, Mexican composer Manuel Enríquez comes out to accept congratulations on the performance of his piece Si Libet by the Great Orchestra of Polish Radio and Television in Katowice under the baton of Eleazar de Carvalho.
The Polish premiere of the work was held on 20 September 1970 at the Warsaw Philharmonic Concert Hall as part of the 14th Warsaw Autumn International Festival of Contemporary Music "Warsaw Autumn".