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"Progressive rock and psychedelic rock are both sub-genres of rock music, but there are some differences between them.
Progressive rock is characterized by complex and virtuosic instrumental arrangements, unconventional time signatures, and lengthy song structures. Progressive rock often incorporates elements of classical music, jazz, or other genres, and emphasizes musical skill and technical prowess. Lyrics tended to be more socially and politically conscious, or explore philosophical or abstract themes. Bands like Genesis, Pink Floyd, and Yes are considered pioneers of progressive rock.
On the other hand, psychedelic rock is characterized by a trippy, hallucinatory sound and a focus on experimentation and musical improvisation. Psychedelic rock often features the use of electronic effects, such as distortion, reverb, and echo, to create a psychedelic atmosphere. The lyrics of psychedelic rock songs often deal with themes of spirituality, mystical experiences, or drug-induced hallucinations. Bands like The Beatles, The Doors, and Jefferson Airplane are considered pioneers of psychedelic rock.
In short, while both sub-genres share some common elements, progressive rock is more focused on technical proficiency and complex arrangements, while psychedelic rock is focused on experimentation and creating a unique, trippy sound."