You can use gentle music, a guided meditation, or nothing at all, but make sure the sit is at least half an hour. (mindbodygreen.com)
I have many friends who are fans of this style of music, but I do not like it, because I prefer more gentle music. (the-bitbeacon.com)
LETTING DOWN: Music for New Mothers Wierzbicki, James & Betsy Feldman A collection of gentle music dedicated to new mothers and their babies. (lllmarivt.org)