Sissy Spacek in Coal Miner’s Daughter, Jeremy Allen White in Springsteen: Deliver Me From Nowhere, Taron Egerton in Rocketman all did their own singing, even with the risk of not measuring up to the icons they played who were all still alive when their films came out.
West Virginian Martin was nicknamed “The Coal Miner’s Daughter” after Loretta Lynn’s signature tune and the Oscar-winning (hmm…) Sissy Spacek biopic it inspired, and her life unfolded like a country song.
It's not like critically acclaimed biopics such as "Ray," "I Walk the Line," "Bound for Glory," "Straight Outta Compton," and "Coal Miner's Daughter" had groundbreaking narratives either.