There has always been a faint and difficult-to-describe difference between the musical projects that become well-known and the ones which doesn't, and it isn't just about quality. Sometimes, the band has an already famous spreader (see the example of The Velvet Underground), a good marketing campaign (as it happens so often nowadays) or even a little bit of luck (as is the case of The Sonics, Nick Drake and another infinty of artists that achieved a good number of fans decades after their disband). The popularization of internet has shown to be the best friend of the members of this third group, because it made much easier the search for obscure bands from all around the world. Since than, the term "world music" is used with regularity when people are talking about musical genres that cannot be search anywere but in a particular region of the globe.
And, more than any other kind of bands, there are those which have been forgotten by the world. If not for some old vinyls, it is impossible to find any trace of their existance. Usually, it happens with mediocre, not-creative groups. But there are some rare cases when relative good, unlucky bands, suffer from this same disease. Those bands never had any kind of re-issue, and the remaining copys of their records are sold from a collector to another. Grupo Água is surely one of them. ...read more here