Roger Glover puts on a star-studded concert at the Royal Albert Hall for his concept album "The Butterfly Ball and the Grasshopper's Feast".Roger Glover puts on a star-studded concert at the Royal Albert Hall for his concept album "The Butterfly Ball and the Grasshopper's Feast".Roger Glover puts on a star-studded concert at the Royal Albert Hall for his concept album "The Butterfly Ball and the Grasshopper's Feast".