Help Me

Talking about the Joni Mitchell hit from 74 (?). What is it about this song that so strongly evokes its time period like no other song i know? when i hear this, i am instantly transported back to some bay area wine bar in the 70s, heavy on ferns and wood decor. maybe with some hippie-ish lady wearing a shawl gently swaying her hips when the song comes on the tape the mustachioed bartender has just popped in the deck. of course i was just a kid when this song was a hit, but i swear i can feel this as i listen. what songs do this weird kind of imaginary time warp for you???