Rush E is a musical meme that originated from the YouTube channel Sheet Music Boss in 2018, initially as a response to the 'E' meme trend featuring a face-merged Markiplier and Lord Farquaad. The song was intentionally composed to be impossible for a human to play, filled with a dense wall of MIDI notes that create a chaotic, Russian-inspired melody. It quickly became a benchmark for 'impossible' compositions and a viral sensation on platforms like TikTok and YouTube, where creators attempt to play it or use the audio to represent overwhelming, frantic, or high-pressure situations. The meme often symbolizes the peak of difficulty or the absurdity of technical complexity in both music and everyday life.