Members of rock band Canned Heat shared a house on Lookout Mountain Avenue in the Laurel Canyon area of Los Angeles, right next door to Joni Mitchell’s place—until it burned down in 1969. Later that year the charred structure served as the setting for the cover of Steppenwolf’s At Your Birthday Party, shot by photographer Henry Diltz and designed by art director Gary Burden. “We just walked in there with a birthday cake, sat down and took...