You’ll find one in every town from Key West to Kuwait. Its burgers (though excellent and 1/2-lb.) hit an outrageous £17, much of the so-called memorabilia consists of instruments that big names played maybe once and tossed, and waiting up to 90 minutes for a table chews up time that could be used for more authentic touring. But this Hard Rock was the world’s first, having opened in 1971, so there is a grudging authenticity.