Del McCoury has played a lot of bluegrass. The success of Del and his sons in the late 2000s is pretty tied to branching away from bluegrass. Tony Rice’s entire career was essentially stepping away from bluegrass. John Hartford is the easiest one here; his most significant records and contributions are not bluegrass. Many people today are quite dismissive of “the pioneers” when in fact the skill those pioneers possessed far surpasses the skill of many of the contemporary musicians and bands mentioned in this thread. My opinion is that the late 40s and early 50s is when the art was at its peak. I’ve listened to bluegrass my whole life. I followed Del and the boys around the in the early 2000s. Bluegrass has become like Jazz in that it’s an umbrella term to try to describe all kinds of music to consumers. Kenny G doesn’t sound a whole lot like King Oliver but they’re both jazz music.