Black And Blue is one of the "hidden" gems of Rolling Stones's 70's output. Although it's not at all regarded as a bad album, many people are a bit indifferent towards it. I think it's pretty damn good actually, and the epic, seven minute long "Memory Motel" is my favourite track. Unsurprisingly, it's written by Mick Jagger and Keith Richards (Richard at the time, without the s on the end), but more unusually they share lead vocals on it. It's a fantastic ballad, and the title refers to an actual motel in Montauk, Long Island.