Each year 25 recordings are selected that are "culturally, historically, or aesthetically significant" and are at least 10 years old. The latest announcement brings the total number of recordings in the registry to 400.
Nominations were gathered through online submissions from the public and from the National Recording Preservation Board, which comprises leaders in the fields of music, recorded sound and preservation.
"These recordings represent an important part of America’s culture and history," said Librarian of Congress James H. Billington in a statement. "As technology continually changes and formats become obsolete, we must ensure that our nation’s aural legacy is protected. The National Recording Registry is at the core of this effort."
The original cast recording of Sweeney Todd was produced by Thomas Z. Shepard. It features Len Cariou and Angela Lansbury in the respective roles of Sweeney Todd and Mrs. Lovett. The musical has a book by Hugh Wheeler.