This recording is a five minute masterclass in jazz singing. It is such a wonderful demonstration of space, swing, collaboration, listening, and mastery. Listen to the way that Ella Fitzgerald and Louis Armstrong interact with each other and their rhythm section to create something really special.
Listen especially to the interweaving singing starting at 3:00 into the recording – Ella weaving countermines around Louis’ melody.
One of the reasons this art form remains an oral tradition is because of recordings like this. You can learn enough from this one album – from this one song – to sustain years of growth.