I've just completed my first run using the C25K app, following my own (less successful) first attempt a couple of days ago. And it went well...found being talked through it so helpful and it seemed much less daunting. No back pain this time either! But there was no music, just dead air between instructions. Is that right? And if so, how do I get it to play my own music? I can't see anything within settings. I'm on an android phone (Samsung). I don't currently have any music on my phone and I assume I'd have to download some (I.e. not stream).