Calibrate

Calibrate helps you experience more profound meditations by playing binaural beats[*] along with your own music. It also facilitates better learning, sleep, creative sessions and more by providing 7 different kinds of binaural beats, each is good at inducing a certain mental state.

A sleep timer is included to wake you up from meditations.

Follow these steps to use this app:
1, Put on your headphones
2, Select a binaural beats by tapping on the top section
3, Select some music by tapping on the mid section
4, Select a duration by sliding the timer bar (if you want it to play until you ask it to stop, slide the timer to "infinity")
5, Tap on the Play button

[*] Binaural Beats: tones that induce meditation, relaxation, concentration, creativity and other desirable mental states.