"They've been going in and out of style, but they're guaranteed to raise a smile" ... these lyrics could apply to many of the works on the registry, which just announced its second list of recordings that are "culturally, historically, or aesthetically significant, and for other purposes" worthy of being preserved. Many of the recordings on the list, like "Sgt. Pepper" (1967) or "Ella Fitzgerald Sings the Cole Porter Song Book" (1956), have remained "in style" and popular since their release. Others, such as Vess Ossman's "Honolulu Cake Walk" (1898) and the steam locomotive recordings of O. Winston Link (1957-1977), you may have never heard, or even heard of. But like those titles on the companion National Film Registry, this is not a list of what is necessarily the most popular or the best, but those that are "significant" nonetheless, as specified in the legislation establishing the registry in the National Recording Preservation Act of 2000.