Fusion band from Uruguay. They mix a lot of South American cultural elements, sometimes adding funky and samba type grooves. The band name is sometimes spelled OPA but it's not an abbreviaton or acronym, making Opa a correct spelling ; the sleeve of [m301696] and other sources confirm this. Opa is a Uruguayan slang greeting, a sort of Hello it says in Angel Atienza's liner notes for Back Home: The Lost 1975 Sessions.