Sega is the name of more than one artist. 1) Sega is a hop-hop artist. 2) a variation on Richard Sega 3) referring to DJ SEGA But most likely it appears here due to incorrectly tagged video game soundtracks. If this non-artist appears in your charts, do last.fm and yourself a favour. Fix your tags by putting the actual artist name in the artist field. The easiest is to use something like Picard.