I don’t know what they are, but if you mean some kind of music or sound, no I find it hinders meditation and is distracting. I may play sacred music at other times, but not during meditation. I can pray in a noisy atmosphere – in church while the choir is practicing, after Mass with all the bustle and chatter, in the chapel when someone else is praying out loud, at the shrine where chant is piped in most of the time, but I prefer silence. In the chapel next to my office there is often a strong base beat that rattles the window because our next door neighbor’s kid has a garage band. That may be the worst of all because it is so “subliminal.”