I've written a number of posts about tuning in the past, mostly about how our now standard A440 was arbitrarily selected. Here's a great video by composer Alan Howarth where he describes Ra tuning (which is centered around 424Hz instead of 440), which is said to be more in tune with nature. As Howarth explains, Ra resonant tuning can be found in ancient structures of the Egyptians and Mayans, and how creating in it allows you to quickly enter "the zone" where everything seems easy.
Check out the video and ramusic.com for more info. You can also convert your own music to Ra tuning on the site to have a listen for yourself, as well as some samples from The Beatles and Bob Dylan.