Throughout the ages, so many tools, processes and practices that should have been a natural part of our daily living in the Light have been hijacked or hidden from us, or were simply corrupted in form, either intentionally or otherwise. One such "gift" is the use of Solfeggio Tones in raising our vibrations, activating DNA codes, chakra alignment, healing and balancing of energies.
There are several ways in which sound can affect us -- through energetic vibrations that affect our biological make-up, which is more than half water content, bearing in mind Dr Emoto's research on the crystalline structure of water; as sound energy that moves through our etheric/auric fields; as sound frequencies that affect our mind, just to mention a few. If we remember how easily it is, then, for sound to affect us, we will realise how much we are subjected to its influences every moment in our daily lives. Also bearing in mind that sound is just as capable of negatively affecting us as it is positively.
The different Solfeggio Tones are believed to be endowed with specific functions such as healing, releasing fear and guilt, aiding in transformational processes, raising vibrations, and more. These are a couple of sites that are excellent sources of information -- Solfeggio Frequencies and Soma Energetics. Of course, there are also Youtube versions of these frequencies, but there may perhaps be a degradation of sound quality as these are supposed to be pure tones.
Of course, there are many more sources available other than the ones I have suggested. Some incorporate several frequencies into one composition, for example, Gregorian chants, Sanskrit toning and even some New Age music. And they sound great!
Update 2 August 2012: Here are some that are available on Youtube (I just extract the audio):
432 Hz The Sound of You
Solfeggio Harmonics 528 Hz Miracle Meditation
741 Hz Frequency Awakening Intuition
852 Hz Frequency Returning to Spiritual Order
936 Hz Pineal Gland Activator Meditation
Solfeggio Master Frequency 1122 Hz Meditation