This list is a personal opinion. Therefore, any songs that were big and are low, doesn't mean they aren't famous, it means I don't enjoy them as much. PYN Below if you want to be tagged.
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She's A Rainbow | Their Satanic Majesties Request | 1967
If you ask me the question, "name off 3 songs that were 100% written with LSD or shit like that", i'd say this, along with Lucy in the Sky with Diamonds by the Beatles & SWALBR by Eric Clapton. This song confuses the fuck out of me, every single time I listen to it. This song is my favourite off the album, and is right before the stones peak. This is the epitome of a love song. And proves that they can venture out of their comfort zone. Yet, the vocals are just different from how I'd love them. In the end, I settled with it here.