I use Pandora or YouTube
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I'm a mobile DJ, so I have to have my own music (as in, own legal copies of my music). I have thousands of CDs, plus I belong to DJ "record pools" which allows me to legally get promotional copies of new music - including radio edits and other versions not always available to the public. These used to be sent out on CD, but today can be downloaded directly.
Anyway, I have a very large music collection, but it's still small enough to fit on a microSD card, so I can carry it all on my phone, and I do. But I also have a copy on my DJ laptop for performances, and either device can be hooked up to various speaker systems I have access to.1