Few albums can be perfect, but many other classic LPs fall short. Maybe it's an out-of-place experimental track or a throwaway song given to the drummer to sing - whatever the case, a single moment ...

Classic rock, which is a genre that began to coagulate in the 1960s and 1970s, is now some 50 or 60 years old. But even back then, the artists writing the songs that would become classic rock hits ...