Jonathan Mann is an American singer-songwriter, best known for creating and publishing a new song and video each day since January 2009, under the YouTube channel Song A Day. Due to his vast quantity of material and speed of composition, his songs often reference immediate current events and popular trends of the very day the video was uploaded. His biting satire and musical versatility have been referenced by Steve Jobs, Paul Krugman, Rachel Maddow and Steve Wozniak, among many others.