Glam is a glitzy rock subgenre that emerged in the 1970s. It is characterized by its use of outrageous costumes, makeup, and hairstyles, as well as its theatrical performances. Glam rock was heavily influenced by the glamour and decadence of the music and fashion of the time, and it often featured themes of escapism and rebellion. Glam rock bands such as T. Rex, David Bowie, and Queen were some of the most popular acts of the era.