I was somewhere between a foetus and a toddler at the time, so I wouldn't expect my suggestion to be in the top tray. Even now, I think it can be filed under "bin"
Yes, Syd Barrett really lets go on that one. I'm a (not very good) bassist and I like how Waters (not the most technical bassist) and Mason hold the groove on Lucifer Sam so that Barrett can play that riff on top.