I have several Theta brainwave entrainment CDs, and this one is my favorite so far. At various times, I can feel the 528hz resonating in my heart chakra. The sound of the tuning fork is pleasantly mixed with the music. And I think I’m hearing tibetan singing bowls as well, but I’m not certain. I use the CD while I’m practicing my affirmations, and I use it during Breath Awareness meditation. The music mixed with the 528hz really keeps me focused and peaceful. I also believe in the healing properties of the Solfeggio vibrations, so I’m just happy over all with this purchase.