Bytebeat is a type of music made using short mathematical formulas that create sound when played as audio. It's like making music through code, usually just a few lines, which can produce complex rhythms and melodies from simple math operations. This became well-known around September 2011, thanks to programmers like viznut, who found out that small C-like formulas could create interesting audio patterns when turned into raw PCM sound. The main idea is that you write an expression using the time variable (t), which is then used to generate an audio sample.