Psychedelic rackkkkk! A genre inspired by hallucinogens such as LSD, which is clearly heard through its use of feedback, electronics, long instrumentals, drug-related lyrics, heavy/distorted guitars, and sound effects. It had two main variants– the whimsy British psychedelic and the harder American psychedelic (also known as Acid Rock). 
This genre is often associated with the hippie movement. In 1969, many psychedelic bands like Jefferson Airplane and Jimi Hendrix played at Woodstock. Woodstock and Summer of Love both happened at the peak of psychedelia.
This same year came the downfall of the genre as many artists passed away from drug use, bands broke up or transitioned into progressive rock. Also, the Manson murders gave the hippie movement a bad name after they claimed that the Beatles song “Helter Skelter” inspired their actions.

The Gnome- Pink Floyd
White Rabbit- Jefferson Airplane
The Red Telephone- Love
Lucy In The Sky With Diamonds- The Beatles
Eight Miles High- The Byrds
The Crystal Ship- The Doors
Venus In Furs- The Velvet Underground
Voodoo Child (Slight Return)- Jimi Hendrix
It’s All Too Much- The Beatles
Why Am I So Short?- Soft Machine
Terrapin- Syd Barrett
All the World Is Love- The Hollies
Fields of Regret- Alice Cooper
Comin’ Back to Me- Jefferson Airplane
Dark Star- Grateful Dead
Kingdom of Heaven- 13th Floor Elevators
Fox Is Sick- The Savage Resurrection
Priscilla- Soft Machine
Breathe (In the Air)- Pink Floyd
White Room- Cream
Magic Man- Caravan
I Won’t Hurt You- The West Coast Pop Art Experiment Band
Mary Jane- The Everly Brothers
Rainy Day Mushroom Pillow- Strawberry Alarm Clock
Bass Strings- Country Joe & The Fish
Titanic Overture- Alice Cooper
One Rainy Wish- Jimi Hendrix
Helter Skelter- The Beatles
Lola- The Kinks