Pandora is a subscription-based music streaming service owned by Sirius XM Holdings based in Oakland, California, United States. The service carries a focus on recommendations based on the "Music Genome Project" — a means of classifying individual songs by musical traits. The service originally launched in the consumer market as an internet radio service, which would generate personalized channels based on these traits and songs liked by the user; this service is available in an advertising-supported tier, and a subscription-based version.