Andrew Gregory Sega (born 20 May 1975), also known by the pseudonym Necros, is a musician best known for tracking modules in the demoscene in the 1990s. Sega began writing MOD music in 1992 for the demo group Psychic Monks. Through the mid 1990s he contributed music to various demo and music groups, and music disks such as Epidemic (1994), featuring other noted tracker musicians like Purple Motion (Jonne Valtonen) and Skaven (Peter Hajba). Sega later helped form the legendary tracking group Five Musicians, which featured other notable figures, such as Jeroen Tel, Basehead and Hunz. He has also programmed .