Is Louis Armstrong - Struttin' with some barbecue copyright protected or public domain?

Louis Armstrong's recording of "Struttin' with Some Barbecue" is protected by copyright. The song was written by Lil Hardin Armstrong, Louis Armstrong's second wife, and has been copyrighted since its creation in the 1920s. As a result, any use of the recording or the sheet music without permission would likely be considered a violation of copyright law.