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The popularity of most the biggest artists of the 1970s still makes sense today. Led Zeppelin, The Rolling Stones, Stevie Wonder, Aerosmith, Donna Summer, Fleetwood Mac, the Bee Gees, hell even Kiss are understandable. You can see why they were big in the 1970s, especially since the music still resonates all these years later.
Not so much Frampton Comes Alive!, which totally and owned 1976. Not only was it the best-selling album of that year, it was #1 for 10 weeks, over a period of six months — starting in April and ending in October — where it would get knocked off for a couple of weeks or even months at a time, but eventually claim the top spot until Songs in the Key of Life finally knocked it from the top spot for good.