Wal-Mart slips in the wake of earnings news. Cisco surges.  And Tesla continues to pick up speed.

Google readies a subscription music service.  Macy's reports a 20% increase in first-quarter profit and raises its dividend by 25%.   And LinkedIn cracks down on the world's oldest profession.

A hedge fund manager calls for Sony to break up.  Tesla has a wild ride.  And AT&T pulls the plug on the Facebook phone.