Also known as "Four O´Clock Blues" originally released on Baton in 1955 b/w "Until the Real Thing Comes Along". Strangely I couldn´t find it on youtube when I searched for it but now I notice a few other uploads of the same tune. The sound is from a cd compilation "Sol´s Story - The Baton Label" on Ace Records. An old blues recorded by many before the Hearts. I wouldn´t be surprised if they had listened to the Roosevelt Sykes version though.