Listening to music is untraditional in Buddhist meditation. Only soft ambient music was offered but mainly silence. If you are trying to listen to your breathing then music distracts you from your goal of diving into self-awareness. Music provides positive feelings which also distract from our goals.
However, listening to music is an excellent way to chill out. Turn it on and lie back to enjoy it without doing anything else. Listen to the lyrics and soak up the rhythm and you may be enlightened by the music like never before.
There are different CDs available to buy with soothing sounds and voices on tracks over 5 minutes long. The sounds roll up and down like waves or breathing. Your breathing could be synchronised with the sound. Lightly played instruments can set the tone of a meditation class and pull you into the mood and out of the blare of traffic noise pollution.
Some yoga classes will play music for the above reasons and to relax you, however it usually provides background ambience instead of providing a service that attendees focus on.
People who do yoga on the beach are quite happy just to be listening to the sounds of the waves crashing.