BalletBox

Here is the app you've always wanted for your ballet class.
Play the songs you love in the tempo and structure you choose. Giving class on the fly? Change the tempo and structure seamlessly even after the music has started!
Make a playlist for the different classes you teach- each playlist remembers the options you change, so next time you go back they are waiting for you.
New music is added weekly; and you can even request the songs you would like added.
Have music already you love? Use music from your iTunes library in your playlists - adjust their tempo and structure!
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In app subscription:
Upon installation your free trial of one week begins. After the free trial period ends, a $4.99 auto-renewing monthly subscription titled "Monthly - All Music" must be purchased to provide ongoing access to the ever expanding ballet music library.
Payment will be charged to your Apple ID account at the confirmation of purchase. Subscription automatically renews unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period.
You can manage and cancel your subscription by going to your account settings on the App Store after purchase.
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Terms of use:
http://www.timprepscius.com/balletbox/1.3/termsofservice.html
Privacy policy:
http://www.timprepscius.com/balletbox/1.3/privacypolicy.html