This song is "Lucy" by Julian Lennon. It is about the same girl that was brought to life
in the Beatles song "Lucy In the Sky with Diamonds" (which is not a drug related song).
[ Tab from: https://www.guitartabs.cc/tabs/j/julian_lennon/lucy_tab.html ]
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-------4-----4-----4-----4-----------------------------|
---2-----2-----2-----2------------4-----4-----4-----4--|
-3---3-----3-----3-----3------2-----2-----2-----2------|
----------------------------3---3-----3-----3-----3----|
Thats about it for the opening riff, repeat how ever many time you want and enjoy.
From, RYAN D. KEMP