Operation Pegasus launched Operation Market Garden, an attempt by the British 2nd Army to bypass the Siegfried Line and advance into the Ruhr, Germany’s industrial heartland. The operation required the First Allied Airborne Army to seize several bridges over rivers and canals in the Netherlands, allowing ground forces to advance and cross the Lower Rhine at Arnhem. The 1st British Airborne Division dropped onto Arnhem on 17 September. They encountered far greater resistance than had been expected and only a small force were able to reach Arnhem road bridge. XXX Corps ground advance became delayed and without reinforcement this small force under
Songs in the Key of Life release around October 1975. It was delayed on short notice when Wonder felt that further remixing was essential. According to Wonder, the marketing campaign at Motown decided to take advantage of the delay by producing "We're almost finished" T-shirts. Work on the new album continued into early 1976. A name was finally chosen for the album: "Songs in the Key of Life". The title would represent the formula of a complex "key of life" and the proposals for indefinite success.<ref name="Lundy pp. 8/9">Lundy, "33 Songs in the Key of Life", pp. 8/9.</ref> The album was released on September 28, 1976,