This is a good recent podcast on that very topic: How Louis Armstrong invented the modern pop star https://switchedonpop.com/episodes/how-louis-armstrong-inve

This is a good recent podcast on that very topic: How Louis Armstrong invented the modern pop star https://switchedonpop.com/episodes/how-louis-armstrong-invented-the-modern-pop-star-100-years https://switchedonpop.com/episodes/how-louis-armstrong-inven...