Court rules no search warrant is needed for police to track Americans' cell phone whereabouts, but says individual judges can "sparingly" require one.

Created as part of The Guardian's Music Hack Day, Piracy app lets users "drop" songs from their music collection in physical locations for other users to pick up later.

Apple in "active negotiations" for song samples with rights holders, but some music publishers want Apple to pay. How the negotiations fare could set the mood for negotiations over cloud music.