interesting contrast to the reference to vinyl, where listening to an LP is purposeful. 

Turn the radio on - and there is a strong element of serrendipity.  Internet play has some of this, with potential upgrade to the the tranny and maybe added convenience relative to the tuner (like wot I got attached to the 'best system').  For me Internet radio is possible when sitting at computer, but even then I prefer the Tivoli FM radio, though I clearly limit the stations I could listen to.