You will find a lot of swing styles which will cover a lot of the 50's stuff. Any of the big band styles were popular back then. Other than Chuck Berry Styles and Jerry Lee Styles I found a Rip it Up Style under the rock Styles. If you sometimes look under the 50's artist's last name, like "Basie", although he was 40's and 50's, you'll find all you need, assuming you have all the BB styles. If not, you need to get them. And then there is Norton Music Styles. He can help you out also. Lots of luck.