Change is a good thing. It keeps life fresh and, as an artist, keeps your audience on its toes. Hell, Madonna owes half her career to her refusal to stick to one genre/persona.
But, Madge's discography is still very much Madge's. There aren't uncharacteristic themes popping up in her tracks. Some artists, however, have grown in such a way that makes their first bits of success seem like the work of another artist (RIP Hannah Montana.) It's not that these songs are bad, they're just so not who the recording artist is anymore. And, hey, that's all fine and grand! Embrace the maturity, right? But, lest we forget these 20 artist's beginnings. The past is, after all, the best education we can get.