This is such a dumb argument. Ask people on the streets if they know Britney Spears and Giuseppe Verdi...
yeah exactly , Led Zeppelin were so much better considering instrumental work, beatles were shit no real guitars, no real bass , only drums were decent. And the style of Beatles songs in majority is better , it was selling great some time ago and now hip-hop or rap is selling great but it doesn't mean that for example some hip-hop "musican" is making better music than for example Praxis only because everyone knows him and he is earning much more money.
Led Zeppelin is history of Rock music as much as Beatles , it influenced such bands like Guns N' Roses, AC/DC, Aerosmith etc , beatles were making more mass music but they were still great. It is what I like about rock they could make great music in terms of lyrics. vocals and instrument and still be popular(in some cases of course)