My personal favourite is the sound of a humpback whale as it reminds me of myself when i was younger so i got a quality recording of one just for you to try, sit back, relax and put it up full blast and it'll work wonders.
link: http://www.youtube.com/watch?v=BuKijpDI5Lw
I've never been to a concert but if you have ever heard a whale and it's beautiful songs in person it is quite miraculous, would reccomend it to anybody and if you want i might be able to get some samples of their songs for you.