I have over half of this great rockabilly series. Each volume feaures a different record company, and some of the rockabilly that they released back in the genre's day. There are some darn fine songs that haven't seen a mass audience since the 50's, some not at all. Volume four cover a record label called Festival, which operated in New York in the 60's. The high point of the Rockabilly scene was in the late 50's to early 60's, the earliest track on this collection is 1961, as the scene was winding down. The tracks on this disc do rock, but they show obvious influence from Rock that came after Rockabilly, some an almost California 60's rock. A nice point of interest on this disc: The original demo for One Broken Heart for Sale by Otis Blackwell is present. This song would eventually be performed by Elvis in it happened at the Worlds Fair. (Blackwell also wrote Don't Be Cruel). Also there are two numbers by a man named Ronnie Dio. The same Dio who would eventually go on to front Black Sabbath after Ozzie Osbourne left. My biggest let down with this disc though was how light it is. The majority of this series all feature around 30 tracks each. The Festival volume only has 16. If you are someone who is just getting into Rockabilly or just beginning to research the history of the music try another volume (like vol. 1-3 which are all very strong.). This is not really the place to start, but if you are a completist or looking for some Rockabilly outside the norm, try this disc.