What’s the more “forbidden” riff: Smoke on the Water, Sweet Child O’ Mine, or Stairway to Heaven?

One is the universal guitar-store alarm. One announces itself in the first two notes. One has basically become a meme in guitar culture.

Why It Matters: These riffs are iconic for a reason, they’re overplayed, but they also define generations of players picking up the instrument.

Team Smoke, Team Sweet Child O' Mine, or Team Stairway, which one gets the strongest reaction, and why?