> I suspect that if Apple did it, they would sell out. They'd stuff these "Undiscovered Music" stations with commercial pablum; rendering the entire concept useless.

Why would they do that? It would be massively unpopular, per your own comment, so I can't understand why that would be a commercial move.

It's not even like an indie radio station selling out, because a radio station is at least (usually) an independent competing entity. It's more like a record shop inexplicably filling its death metal section with madrigals.

It would simply lose those customers who liked it, and not even gain any others, since pop customers want the opposite thing (and are already amply catered to) so wouldn't even click on it to begin with.