Gracenote

Gracenote, Inc. is a company and service that provides music, video, and sports metadata and automatic content recognition (ACR) technologies to entertainment services and companies worldwide. Formerly CDDB ("Compact Disc Data Base"), Gracenote maintains and licenses an Internet-accessible database containing information about the contents of audio compact discs and vinyl records. From 2008 to 2014, it was owned by Sony, later sold to Tribune Media, and has been owned since 2017 by Nielsen Holdings. In 2019, Nielsen Holdings announced plans to split into two separate publicly traded companies, Nielsen Global Connect (later known as NielsenIQ and sold) and Nielsen Global Media. In October 2022, Nielsen Holdings (by then consisting of the Global Media business), including the Gracenote subsidiary was acquired by a private equity consortium.

== History == Gracenote began in 1993 as an open-source project involving a CD player program named xmcd and an associated database named CDDB. xmcd and CDDB were created by Ti Kan and Steve Scherf. Because CDs do not contain any digitally-encoded information about their contents, Kan and Scherf devised a technology that identifies and looks up CDs based on TOC information stored at the beginning of each disc. A TOC, or Table of Contents, is a list of offsets corresponding to the start of each track on a CD. Its original database was created from and continues to receive voluntary contributions from users. This led to a licensing controversy when Gracenote became commercialized.