They're not supposed to use recorded music, but they can play anything they want for the prelude (before the entrance) and the recessional after Mass. Some churches do a fairly long set of prelude pieces, and this actually does keep the chit-chat down.
Hence the use of living flames for candles (no electric stuff), real bells, incense, etc.
CD's are good in their proper place. The sacred liturgy is not the proper place. The prayers (music if sung) should come authentically from those present.
An orthodox bishop told a friend of mine that according to Canon Law, the only recorded music that can be "played" in church is Gregorian chant. I got to hear the monks of Santo Domingo de Silos chanting in a church in NJ. It was quite conducive to prayer at the appropriate volume, not to mention it was very beautiful.