Some would simply call it an evolution of style, and others might call it a sellout. I’d like to hear your examples of musical acts that changed so radically over time that you’d consider it a sellout.
My example would be Jefferson Starship. Their first album was “Blows Against The Empire”, which was about hippies hijacking a starship. https://www.youtube.com/watch?v=HzclibWeXM8&t=1126s
Grace Slick was the first person to say “motherfucker” on television when performing their material.
They went from that to shedding personnel, renaming themselves “Starship”, and making pop music. https://www.youtube.com/watch?v=IDI2WQJyE7I
What are your before and after examples that you consider a sellout?
It’s taken me years to regain an appreciation for their post-Duke catalog. I was intensely negative on anything later for close to 15 years. Slowly I’ve been able to rediscover what it was about their later output that I initially liked, and maturity has smoothed out some of my own rough edges as well. I still find We Can’t Dance to be unbelievably limp and lifeless, though.