If I bought one of those single ear bluetooth things that people talk on the phone with could I use it to play music?

Of course you can. But it will be mono and horrible sounding. Longterm use of single ear mono music earphones can also cause ear damage.

I used to use a jabra BT(some numbers). It is stereo, binaural, earbud system. But all BT systems are prone to electromagnetic disturbunces.

Cool thanks. I would pretty much only use it when I run, I don't like having 2 earphones in running on the road.

Not all Single hands free stream music. Look at the info/packages of the ones you are considering. I just bought one myself for hands free and music. I wanted a cheap one, as I already have a great set of bt headphones. I could not find any of the cheap ones that do it. I spent $59 at BB on a BlueAnt. Works great

The headset has to support a2dp.
I would love to hear (read) the explanation for why long-term use of a single ear headset playing music can cause ear damage as opposed to headphones not causing the same damage to both ears.

Don't bother with single ear. Get the jaybird f3. Great sound and won't go anywhere while you run. Sound quality is defined enough to listen to classical music and still hear cars and other peds.

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