"Mailman, Bring Me No More Blues"

I listened to Buddy Holly's Memorial Collection last month and noticed a small feature in "Mailman, Bring Me No More Blues" that's also present in the Beatles' impromptu performance of the song, included on Anthology 3.

In the titular line, "blues" is sung with a melisma (C# C# B B A), so while it's negated, there's a sense of amount.

The Beatles perform the song in the same key as Holly (A major), but this specific melisma is one note shorter than what Holly sings (C# C# B A B A).