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compressed music and considering bluetooth for use during sports... cheap is the answer!
I have a set of these for running:http://www.amazon.co.uk/Mpow-Bluetooth-Earphones-Headphones-Hands-free/dp/B00W6VS9CM/ref=sr_1_14?ie=UTF8&qid=1449229306&sr=8-14&keywords=bluetooth+headsets+sportsWork well enough, stay in and sound OK for short periods. Slight crackling when you receve a text or msg on the phone but could just be my handset.
I'll be listening to Ogg Vorbis so that'll give you an idea of definition of 'good' I'm looking for.