Here's a lovely Mashup which integrates the theme song from Magnum PI with Under Pressure and (perhaps ironically?) Bittersweet Symphony... as well as 26 other beats and vocals....
What I find personally interesting about this stuff is that I was a DJ for a disco club way back in the day. I took pride in synching tunes by their rhythm and beat. I worked all day long building a smooth set so that in the evening the experience for the audience was seamless. So, these days, if I hear a DJ mixing tunes at a bar or a wedding or a Bar Mitzvah, I will literally cringe when the overlapping beats clash randomly and thoughtlessly. Where is pride in craftsmanship?
But then, I come across something like Ithaca Audio and heave a huge sigh of relief. They are taking the craftsmanship of the top notch DJ aesthetic into another realm. Ok, I only had two turntables and a mixing board. With this technology, they are doing things I never dreamed might be possible.
Is it an art form? The tools may be new... but yes, of course it is.