By 1967. everybody went psychedelic so did the Pretties. There are a drastic changes in their sound from raw R&B punk to trippy side of rockin' spectre. The Pretty Things signed to EMI's Columbia label and recorded these two psych 7" jewels that marked the beginning of SF Sorrow era of sound. Comparing to the Who or Stones adventures in psych, from my point of view The Pretty Things are way more trippier, natural and succesful inchange of their basicsound. Furthermore, these two 45's are some of the best examples of 60's UK psych.
...Trip Trip Trippin'...