Rock is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, developing into a range of different styles from the mid-1960s, particularly in the United States and the United Kingdom. Rock is a genre that has given voice to rebels and dreamers alike, with artists like Led Zeppelin and Queen crafting anthems that echo through generations. Punk pioneers like The Ramones and Green Day fueled the fire of rebellion, while icons like Aerosmith and Guns N' Roses brought swagger and showmanship to the stage. Meanwhile, bands like Pink Floyd and Radiohead pushed the boundaries of sound and experimentation, expanding the possibilities of rock music.