And check out this excerpt from that RollingStone Magazine article:
[list'...Any song that mentions snakes, uses a snake metaphor, or alludes to snakes is eligible — we're not limiting it to merely songs that include the word 'snake' or a snake-ish reference in the title. We'll show you ours if you show us yours.
Lloyd Cole, "Rattlesnakes" Duran Duran, "Union Of The Snake" Aerosmith, "Rattlesnake Shake" REM, "The Sidewinder Sleeps Tonight" Paula Abdul, "Cold Hearted Snake" ELO, "Don't Bring Me Down" Pavement, "Serpentine Pad" The Doors, "The End" PJ Harvey, "Snake" Bow Wow Wow, "Where's My Snake" " -snip-
So Guest, I'll repeat that last sentence from that excerpt I quoted: "We'll show you ours [our list]if you show us yours [your list]".
That means that your statement that its' "Already been done before" is not totally true, wouldn't you say? The concept. Yes. The entries in the list. No.
Surely an old hippie like yourself knows a snake song or two that you could share with us or maybe you added your examples to that RollingStone list.