There is a CD with a baby on the front, "Music for Dreaming", which both my babies have been settled by.

When Emily was in the NICU, the "music therapist" would arrange softly played CD music for unsettled babies, starting with lullabies with no vocals, and sometimes even taping mum's voice reading stories to help settle baby to sleep. In Special Care, they used CDs of womb/heartbeat sounds to help settle babies sometimes.