Harvey Karp's The Happiest Baby on the Block presents his special guaranteed procedure for calming your baby's crying. it's all based on his theory that the first three months are like the fourth trimester -- the baby would rather still be in the womb, so the best thing you can do to calm them is simulate the womb. this translates to things like swaddling, rocking, and white noise.

I decided to make some music that would sound like the womb -- basically ambient stuff with an emphasis on white noise. I've added in other low-frequency noises, beats like a heartbeat, and samples of things like movie dialogue or favorite songs that I hope will be soothing.

More info about these recordings in my blog. comment there or email me if you've made some similar music or have tried these on your infant.