US seconded by UK thirded by the frankly underrated Canada. If California were it's own country it'd still probably be in the lead. Yet, USA has a definitive geographical advantage, if you were to take a United States sized portion out of Middle Europe you'd be miles ahead of the rest of the list, even if they aren't English speaking countries.
Non-English countries like those from the Netherlands, Japan, and Russia(mostly for classical) also definitely are strong competitors even if not valid list choices for obvious reasons.
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