If you want to use your own music in the MindRazr sessions you must first ensure that it is downloaded on to your device. MindRazr can only use music that is actually on your device and can't for example use music you have purchased on iTunes or Google Play but which has not been downloaded to your device.
For more information on how to download and install purchased music, please see the following links:
Music purchased from iTunes:
Music purchased from Google Play:
MindRazr cannot stream music from your Spotify or Apple Music account.