You need no excuses to listen to Gregory Porter. It’s always a delight. If you’re inspired to cover his songs, do your detective work first. Like a lot of jazz singers (Amy Winehouse comes to mind) Gregory often ghosts consonants like d, t, n & m at the end of words. Softened endings often suit the jazz mood. But be careful when you sing a cover: a softened consonant isn’t the same as no consonant.
Try this exercise: in his song Be Good (Lion’s Song) Gregory sings the phrase Be Good fifteen times. Can you hear the d sound every time? Does the d sound exactly the same every time?