Hello everyone,
I've developed MixMyPart.com which is an online application to help singers learn their harmony parts and practice from home. Teachers, Choir Directors, and Music Directors can prepare their own recordings for use in our multitrack media player so singers can control how much of each part they hear for learning and practicing at home or even on their mobile devices with the Puffin Browser (not associated with us). It's now being offered completely for FREE so please take a look at the website and try out the Demo on the home page for yourself. Singers don't need to sign up for anything because the links to the media you post are shared just as easily as you would share a YouTube video link and they only need to enter whatever password you've set for the media you post.
Let me know if you have any questions about it or need any help to get things set up or started. I'm usually available. You can call or email from the contact page on the website.
I hope you enjoy it and I'm glad to provide it for free!