Did you make it to sell it? I assumed it had always been a Hal Leonard product and didn’t realize they’d done an acquisition.
More specifically, the G-Plus lesson interface of Guitar Instructor used to be Tunessence. It was a labor of love that we definitely did not build with the intention of selling. We wanted to teach people music through their favorite songs. Ultimately the licensing required to do that proved to be a hurdle we couldn’t clear, so we’re very grateful the product is able to live on in a great home. As the largest publisher of music, Hal Leonard was an obvious and great fit.