Put it this way.
This Beatles have not put out any new music in nearly 40 years.
Yet...................................
#1) Their back catalogue is far and away the highest selling of any musical entity. Ever.
#2) Apple has tried, ever since the invention of Itunes, to acquire the digital rights to the Beatles. To no Avail, no matter how much money they have offered them
#3) Beatles One, which was a collection of #1 Songs released in 2000, 30 years after they split up, sold 11 million copies in the United States and 28 million worldwide. For a greatest hits album. Of 30-40 year old songs
#4) Pre-Orders for the Digitally Remastered sets of CD's and "The Beatles Rock Band Game" are sold out everywhere. I can't even get my hands on them, and I'm probably the biggest Beatles fan in Rhode Island. Again, this is concerning a group who hasn't been around for 40 years and whose music that is even older than that.
For anyone to disregard what the Beatles accomplished on a purely musical level is absolutely insane.
They changed the world, not only as how performers are viewed, but as how songwriters, and the evolution of songwriting, producing, studio technology is concerned are viewed.
How do you explain it? How do you explain the everlasting phoenomenon that are the Beatles?
It is the music. Plain and simple, it is the music. In the end that is what they are remembered for. 500 years from now, their music will still live on.
Anyone who is anyone the last 40 years are directly influenced by The Beatles. Aerosmith, Bruce Springsteen, Billy Joel, Elton John, U2, just a few of the hundreds of groups who have flat out said that The Beatles were their main influence in music.