Jack Johnson - imagine David Gray mixed with a significantly more layed back approach to life, add some chilled guitar and simple beats and you may be a tiny bit closer to what Jack's music is about! Frankly I can't do him justice or find a metaphor to describe him you just have to listen. I was a Huge fan of his last album "Brushfire Fairytales" it was amazing (go and buy it!) but his new album "In Between Dreams" is even better! It was recorded in Hawaii and the chilled vibes pass through the whole album, it really is great to relax to, you just get the feeling that life is not as bad as you think and that things will be ok if you just mellow out! I can't recommend this guy enough!