Operation Ivy existed for only two years, during which time they changed the DNA of punk music forever by merging hardcore velocity with peppy two-step rhythms, resulting in an often imitated (but never duplicated) sound. This album compiles their brief-but-brilliant original discography into one document, showcasing guitarist Tim Armstrong’s herky-jerk riffs on tracks like “Take Warning,” and displaying singer Jesse Michaels’ sincere pleas for dancing instead of violence on the party-starting “Unity.”