It’s FREE to listen to all the cool riffs on Riff Raters Lite. Check out the thousands of awesome “riffs” recorded. Called Musical Social Networking by AppCraver. For only $.99, get the Riff Raters app and be able to rate and record riffs. Join the thousands of Riff Raters fans! A riff is like a musical “tweet” or a 20 second melodic phrase. We have all instruments and genres: funky bass, rocking guitar, jazzy piano, rapping vocals, hardcore drumming, singing dogs, ripping horns.