Psychedelic rock is a subgenre of rock that emerged in the '60s. It is influenced by the psychedelic culture of the time, and psychedelic (psychotropic) drugs, such as LSD and marijuana. The musical style often incorporates flowing, hypnotic rhythms. Typical instruments associated with the genre include electric guitar, which is often augmented with effects pedals; various types of organs, which include Hammonds and Farfisas; bass guitar, and drums. Vocals in psychedelic rock music are also sometimes augmented with effects.