H. P. Lovecraft was a psychedelic rock band from Chicago in the late 1960s. They moved to San Francisco after their first album. They were probably best known for naming the group after the cult horror writer. They split up in 1969, after which two members formed a new lineup to become Lovecraft (and later Love Craft).
Although H. P. Lovecraft released two albums and were popular in the acid-laced San Francisco area, they never reached the heights they deserved.
"At the Mountains of Madness" is from their second album. The title comes from one of HPL's (the writer) best stories.