I don't know about that. It would depend on just what kind of pop music you'd take as an example. There are scores of god awful pop acts in Portugal which are even several cuts below what pollutes most American airwaves (read: Pussycat Dolls, Avril Lavigne, Gwen Stefani), but there are also some genuinely great ones which only lose out in popularity thanks to erratic media promotion and the often general belief that we can't compete with American pop music. It's not uncommon to have Portuguese acts make great one or two albums then fading into obscurity or spintering off into other bands.
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Then they would fail at being popular music, by definition, wouldn't they?