13. A system comprising: one or more computers and one or more storage devices storing instructions that when executed by the one or more computers cause the one or more computers to perform operations comprising: maintaining a list of music sites, wherein a music site is a web site that provides access to music or music information; receiving a query; obtaining a plurality of search results responsive to the query, the search results being results from a search of web resources on the Internet; determining a count of the plurality of search results that identify resources on respective music sites that are in the list of music sites; determining that the query is a music query including determining that the count of the plurality of search results that identify resources on respective music sites satisfies a threshold; in response to determining that the query is a music query, obtaining music data for a song responsive to the query, where the music data comprises a Uniform Resource Locator (URL) of song content of the song on the Internet; generating a music answer box for the query, where the music answer box comprises the music data and a link to the URL of the song content; and providing the music answer box in addition to two or more of the search results.
13. A system comprising: one or more computers and one or more storage devices storing instructions that when executed by the one or more computers cause the one or more computers to perform operations comprising: maintaining a list of music sites, wherein a music site is a web site that provides access to music or music information; receiving a query; obtaining a plurality of search results responsive to the query, the search results being results from a search of web resources on the Internet; determining a count of the plurality of search results that identify resources on respective music sites that are in the list of music sites; determining that the query is a music query including determining that the count of the plurality of search results that identify resources on respective music sites satisfies a threshold; in response to determining that the query is a music query, obtaining music data for a song responsive to the query, where the music data comprises a Uniform Resource Locator (URL) of song content of the song on the Internet; generating a music answer box for the query, where the music answer box comprises the music data and a link to the URL of the song content; and providing the music answer box in addition to two or more of the search results. 24. The system of claim 13 , wherein the operations further comprise: classifying one or more terms of the query as a musical artist name, a song title, or an album title; and identifying the song responsive to the query including identifying a song with a matching musical artist name, a song title, or an album title.