The retailer, which has held back its marketing spend for the period, is increasing it in the coming months by 38% year on year to £23m.
On Saturday, John Lewis will roll out a £7m integrated campaign highlighting its 86-year-old "Never knowingly undersold" pledge.
The TV ad by Adam & Eve pushes the retailer's electrical products. It features consumers listening to pop songs through the decades. Artists featured include Sir Elton John and The Smiths.
The brand has already rolled out ads for its new store in London's Westfield Stratford City shopping centre, as well as its first marketing campaign for beauty products.
Craig Inglis, director of marketing at John Lewis, said: "[The build-up to Christmas] has always been our key period, but we've tended to spread our marketing investment across the year.
"It makes sense to concentrate later on in the year, as that is when we get our best returns."
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