The Sheet Music Boss meme originates from the popular YouTube channel of the same name, run by musicians Andrew Wrangell and Samuel Dickenson. They became internet legends through their 'Rush E' series, which transformed a simple joke about the letter 'E' into an increasingly impossible series of piano arrangements. The visual signature of their videos—using Synthesia to show a 'waterfall' of millions of notes—became a shorthand for overwhelming complexity and chaos. In meme culture, Sheet Music Boss is used to represent the ultimate level of difficulty, 'god-tier' musical skill, or the absurdity of black MIDI compositions that would be physically impossible for a human to play.