Queen are unique among the great rock bands. It is nearly twenty years since frontman Freddie Mercurys death brought the band to an end yet their fanbase remains massive. They appeal equally to men and women. Their fans are just as likely to be teenagers too young to have been born when the band were still touring and making records (thanks not least to the huge success of the musical We Will Rock You). And their musical history is one of constant reinvention from heavy metal and prog rock to disco pop, stadium anthems and even jazz influences.