Sing! Karaoke by Smule is none other applications created by developers called Smule and debuted on August 8, 2012 in the App Store. Smule for this application is the most successful project that delivers Smule into position now. Although long before Sing! there are some applications that were born first. As Sonic Boom, which was launched in 2008, then the Magic Fiddle in 2010, including Glee Karaoke is also working on the same category.