Whole Lotta Money.

Amazon sales boosts sales of classic acts.

Led Zeppelin, Pink Floyd, George Harrison and Fleetwood Mac are among the classic rock acts who have benefited from a mega-sale at Amazon and Google Play. Last week, Amazon sold Zeppelin's two-disc Mothership hits collection for just $2.99 and people bought it. As a result, it jumped from 157 to 20 on the Billboard 200 album chart, becoming the biggest-selling album for the week by a veteran artist.

Queen's Greatest Hits went from 167 to 59; Fleetwood Mac's Greatest Hits re-entered the chart at number-65 as did Pink Floyd's Dark Side of the Moon at 74; and George Harrison's collection, Let It Roll at 80.