Either i'm just a total music nerd or an asshole but, You must have got this song off Napster or the equivalent.... The Dope Smoking Song which I only know to be available on Hempilation 2 (1 is also a great listen) is actually by Hank Flamingo and yea it would seem to be the version you're thinking of.... "so if you got em smoke em save some for the boys in the band"
The Dope Smoking Song by David Allen Coe. I've only heard a live version recorded in a club
'you sing the low notes.... Brother I sing mine high'
Top 5... well the 5 the come to my head first anyway:
Hey Uncle Sam Leave us Pot Smoker's Alone - The Toyes (off the same album as Smoke 2 Joints, better message, no?)
Don't Step on the Grass Sam- Steppen Wolf (Govt Mule does an awesome cover)
My Stoney Baby - 311
Legalize It - Peter Tosh
Pass The Kutchie - The Mighty Diamonds
I think Peter Tosh's Legalize it is the only one that anyone can argue isn't a top 5, that song works on so many levels in so many countries.