Lallapalooza is a popular music festival that has been held annually since 1991. It was founded by Jane's Addiction singer Perry Farrell and originally featured alternative rock, heavy metal, punk rock, hip hop, and other genres of music. The term 'Lallapalooza' is derived from the phrase 'lalapaloosa, ' which is an old American expression meaning 'a great commotion or fuss.' The festival has become one of the most popular music festivals in the world, with millions of people attending each year.