Thanks for explaining the methodology. At first I was thinking this was about cultural impact, so you'd expect Mississippi, Louisiana and Tennessee to rank highly, given their history of shaping jazz and country music.
The top five results are more a function of those state's large population, in my opinion, and not because they necessarily had the biggest impact on America's musical history. It's just that those states have produced a lot of people, so the odds are in their favor. In fact, all ten answers are in the Top 15 or so for US States by population.
I'd say less to do with population and more to do with where the major music hubs have been since the 60s. L.A, NYC, Motown, Atlanta, Austin, Philly, Miami, Chicago and Nashville have been cultural hotbeds in this period, with NJ probably making the list due to the state being a mix of NYC and Philly. (Probably the only big ones missing from this list are Seattle and New Orleans, but jazz and grunge generally don't chart well.)
Funny how New Jersey pops up here without a single entry on the Cities of Origin quiz - because it's all a part of either the NYC or Philly metro area. Bon Jovi, Bruce Springsteen, The Four Seasons, Patti Smith, and possibly Steely Dan. Nice.
The top five results are more a function of those state's large population, in my opinion, and not because they necessarily had the biggest impact on America's musical history. It's just that those states have produced a lot of people, so the odds are in their favor. In fact, all ten answers are in the Top 15 or so for US States by population.