Close your eyes for a moment, and picture John Lennon.
What did you see? A Brit with a bowl-cut wearing a smart suit? A long-haired sage with round glasses and flowing clothes? Or did you picture a regular kid, full of promise and ambition and youthful spirit?
Before you're through with this gallery, you might think about your favorite rock stars a little differently.
Even this photo of a young Britney Spears (next to an equally fresh-faced Ryan Gosling) shows the stunning reverse transformation from the plaid-clad teen who achieved global fame six years later.
We dug up some truly fascinating photos of music's biggest stars before they were famous. Some of these rock stars were born into performance. Bruno Mars was onstage regularly since he was a toddler, and the Bee Gees were a band almost as soon as the brothers were old enough to pick up their instruments. Others, like Jimi Hendrix and Ringo Starr, didn't settle into their path until well into their teens.
Young Mick Jagger even considered getting into journalism or politics.
Keep going to see what your favorite artists looked like before they hit it big.