"There's a difference between the blues of the New Orleans guys and anyone else and the difference is in a chord, but I can't figure the name of it. It's a different chord, and they all make it"

Jimmy Rushing is referring to the distinct sound of New Orleans blues. He is recommending that there is a particular chord that is used in New Orleans blues that is not used in other kinds of blues music. He is unable to name the chord, but he makes sure that it is various which it is what provides New Orleans blues its unique sound. This chord is likely a minor chord, as small chords are frequently used in blues music. It is likely that the chord is a small seventh chord, as this is a common chord utilized in blues music. The chord is most likely utilized to create a more melancholic sound, which is often connected with blues music. The chord is likely used to create a sense of yearning and sadness, which is typically related to the blues.