Nominate Songs For The Library of Congress National Recording Registry
For instance, back in May it was announced that songs like Prince and the Revolution's classic "Purple Rain" and Sugarhill Gang's "Rapper's Delight" were added to the registry and were selected because there were "aesthetically, culturally or historically important and deserving of permanent housing within the nation's library."
Unlike the Rock and Roll Hall of Fame, you can have an input about which songs should be reserved in the registry. The Library informed us that "while the Librarian depends on the input of the National Recording Preservation Board for his ultimate selections, the list is also impacted by public nominations. Anyone can send in their suggestions. Those who want to submit via e-mail can send to: firstname.lastname@example.org."
You can read more about the registry, see which songs and titles have already been added and more here.