Effective period / Period of releases: 1972

The most accepted theory is that the recording was made by a group of international studio musicians based in Mexico.

Research so far has thought us this was recorded in Mexico, based on:

- All the tracks have their publishers as Mexican companies Ediciones Fremex , Edim. EMMI. Orfeon and PHAM
- Catalog numbers/label codes correspond to Mexican RCA Victor recordings
- Los Hermanos Rigual, despite being of Cuban origin, settled in Mexico where they actively recorded and produced a lot of records in that era.
The self-titled album feautures a couple of their tracks in writting credits (could be covers) but also credits in arrangements.

The rest of the musicians are still unknown.