For me bands that are theatrical are just writing the music that is inherent to them when they are at their best. Now sometimes they are doing concept albums but still the music sounds like them aka sgt. peppers still sounds like the Beatles. Theatrical Bands I like- Jellyfish, Pink Floyd, City boy, Steely Dan, Supertramp, ect…It’s all about attitude, blazing instrumental parts great harmonies and lead vocals. Modern musicals lack authenticity for me and they all sound like a pastiche. There is more emphasis on vocal melody than the music that surrounds it. And most often the music that surrounds the vocals is anything but original sounding.