OneBox debuted in the US in October 2009 and pushed users towards legal music services - including Pandora, Rhapsody and imeem - as well as offering an embedded player that users could activate within their search results window.

A statement from Google said, "The music search feature introduced in 2009 is currently unavailable while we make some updates to the user experience."

This has triggered speculation that the updated version will be incorporated into the company's long-rumoured Google Music cloud-based ...