I can't steam when my mobile is offline. Nor do I feel like wasting data on streaming audio. Maybe in my office, but even then I prefer playing music locally vs streaming. I stream Netflix, but only when I'm not doing anything else online.
I really want to share Tunelf Spotify music converter with you. Really great and charming! Via that, I download and record any my favorite tracks on Spotify. What's more, it help you to convert Spotify music to mp3 and then I could listen to them on any device.