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If you're running stock android (ie, Samsung has it's own Samsung Bluetooth stack that none of this applies to) they recently re-wrote the entire thing for either 4.3 or 4.4. It added the ability to run in BLE (Bluetooth Low Energy) and to send audio information like title and artist information. These didn't work before. However, though in my experience things mostly improved, there could still be some weirdness to it.
And then, as I mentioned earlier, other OEMs like Samsung could be using their own thing entirely. For instance, Samsung was sending artist information since 4 or 4.1 at least, if not longer.
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