Sitting in the bed and just listening a high-frequency music for the third eye is not a meditation. I never used but I don't recommend. Basically with the binaural music you are artificially inducing a condition which you should be able to achieve by a natural meditation, vibrating a power word because the vibration will generate the energy which will stimulate your third eye. Doing this on a consistent basis, I think even daily, together with visualisation exercises and the stimulating of the clairvoyance centres on the head, after a while (depending on you), you should be able to see in astral.
http://web.archive.org/web/20150915062217/http://www.angelfire.com/empire/serpentis666/Clairvoyance_Points.html