Originally a space rock act, Great Britain-based UFO poached guitarist Michael Schenker from the Scorpions and embarked on a five-album run of hard rock domination. Strangers in the Night came at the tail end. This presents a portrait of a band tearing apart at the seams (Schenker left mid-tour) that gives a jolt of energy to already-classic tunes like “Rock-Bottom” and “Lights Out.” The studio versions were nothing to sneeze at, but the speed and sweat invested in these arrangements blazed the trail straight to the New Wave of British Heavy Metal.