Instead, you can use a concept called "brainwave entrainment" to get the same effect.
Brainwave entrainment is any method that causes your brainwave frequencies to fall into step with a specific frequency. It's based on the concept that the human brain has a tendency to change its dominant EEG frequency towards the frequency of a dominant external stimulus (such as music, or sound).
The type of sound frequencies that are typically used in brainwave entrainment are called "binaural" beats. The way that these work is that two tones close in frequency generate a beat frequency at the difference of the frequencies.
I know this sounds complicated, but it's pretty simple to understand when you think about it. For example, a 495 Hz audio tone and 505 Hz audio tone (whether overlaid in music or in a sound frequency) will produce a 10 Hz beat, roughly in the middle of the alpha brain wave range, like this:
DarrellWolfe.com via Mobile