Progressive rock sprang up at the cusp of the 70s, nurtured by the late-60s worship of “virtuosos” like Jimi Hendrix and Cream and the move away from pure rock ‘n’ roll song forms that followed Sgt.

I know it’s hard to believe, but the classical music world’s been getting real interesting. Over the last year a British pianist named Joyce Hatto (who passed away in June) has developed something of ...