Headphones are not just for music, and are adding mics and mini controllers to switch between listening and phone calls. Similarly, Bluetooth headsets are not just for phone calls, since you might as well enjoy all that music on your smartphone when you're not on calls.
But music is stereo and immersive, while Bluetooth headsets are just for one ear. So the answer is to use two earpieces, like the Plantronics BackBeat GO Wireless Earbuds -- connecting the left and right ears with a wire, but still wireless to your phone.
The wire also provides a location for an inline controller, so you can use Bluetooth to
adjust volume / mute, answer / end calls, play / pause music, skip between tracks, and even check the battery level.
The earbuds provide sound isolation, with three sizes of cushioned eartips to fit your head, plus optional in-ear stabilizers for more active use.
With the BackBeat GO earbuds, you can be on the go for around four hours, switching between phone calls and listening to music or podcasts. They also include noise cancellation and echo cancellation for better clarity.
The BackBeat GO earbuds are available for $99.99 in black or white.
See my update on holiday gadgets -- Portable Accessories - Holiday 2012 -- for more on portable devices and accessories.
Find the Plantronics BackBeat GO earbuds on Amazon.com