Marvin Gaye's version has stood the test of time, but it was Gladys Knight and the Pips who recorded it first -
https://www.youtube.com/watch?v=SFjJLMHRHFI
Also, I have way too many favourite songs to name one, but wanted to suggest for
@once_upon - Beyonce has a lovely cover of
Blackbird on her Cowboy Carter album, and if you love
Flowers by Miley, I highly recommend my favourite of her songs,
Malibu. It was written when things were still good with Liam, whereas
Flowers represents her (maybe finally, not sure) getting over him - within the lyrics of
Flowers are several callbacks to the lyrics of
Malibu.