I am an Amy Winehouse fan and I love Beyoncé. They have two totally different vocal styles and voices. Those saying Adele or Christina should have covered the song are totally wrong. Adele has a gospel soul tone, but not a deep, emotional soul like Amy. Christina’s voice is shot and would sound too young and she doesn’t have deep soul like Amy either. I will wait to judge the cover. Beyoncé is a trained vocalist and her voice has gotten stronger with age.