That's a scientific fact, I'm pretty sure. And if it's not, some scientists had better get working on it. Anyway, in honor of Valentine's Day, here's some evidence in support of that (irrefutable) hypothesis:
Exhibit A: Here Comes My Girl, by Tom Petty and the Heartbreakers (Valentine's Day special!)
More evidence below the Squiggle of Doom
Exhibit B: Mercury Blues, by Steve Miller
Exhibit C: Shooting Star, by Bad Company.
Exhibit D: The Load Out / Stay, by Jackson Browne:
Exhibit E: Stop your Sobbing, covered by The Pretenders
Exhibit F: Roland the Headless Thompson Gunner, by Warren Zevon (this, the best performance ever perhaps by Zevon, was done in 2002: