This is what is so amazing about our culture; there is always something new to discover. When I was in my thirties I feel in love with the abstract expressionists. I remember seeing my first Rothko live and in person at the Denver Art Museum after stumbling across the artist on the internet and loving the idea of his artwork, then the artwork itself. I remember seeing Pollock's Lavender Mist at the National Gallery and being amazed by it's scale and the way that you could get lost in the painting because of its scale and rhythm. And the really amazing thing is that, in addition to new artists, who, of course, are building on the work of their predecessors either by imitating their techniques or actively rejecting them, there are always new to you established artists to discover. I've recently been drawn to the work of Cy Twombly, personally.
So, while it may be tempting to mock these young 'uns because they don't know who Paul McCartney is, we should always remember that there was once a time when we didn't know who this guy was either and remember the joy of discovering a new artist. I do hope that some of these kids take the time to research the Beatles and hopefully draw some inspiration from their work just like Kanye West did.