Indie music is formed around a DIY ethic and watered-down punk sound. There are several indie subgenres including indie folk, indie rock, and indie pop. Many indie artists share aspects of a look including jeans, t-shirts, plaid shirts, and "classy" shoes. However, indie values independence so styles can vary. Common conventions include the use of guitars, banjos, and other acoustic instruments, dressing appropriately for the season, and ambient lighting for indie folk videos and photos.