Picture book biographies and biopics are fairly common. Biosongs, however, seem relatively rare. In fact, I may have just made up the word.
One song I have long loved is Peter Gabriel's "Family Snapshot," though I only just now learned (from Wikipedia) that it was not, as I have long believed, inspired by Lee Harvey Oswald.
A truer biosong, and the inspiration for this post, is "Mary Pickford" by Katie Melua. It's almost a companion piece to Don Brown's nonfiction picture book Mack Made Movies, about silent film director and comedy pioneer Mack Sennett.
I have no plan to write about Pickford, or Melua, but encourage you to check out the song, both for the bio-aspect and for the music and lyrics themselves.