You know I'd love to do that, but Google wants me to buy some Cloud storage that's only there if I'm connected to the internet, only there if I have data left this cycle, and only 5s of latency to open the file if I have a solid LTE signal in a non-downtown area. Otherwise (and believe me, there's a lot of otherwise), forget it.
So they don't put microSD slots in their phones anymore. Dummies.
Thankfully I just stopped fighting on this matter. I have one station that I like to stream if I want some background music, it's 100kbit/s streaming ogg (sounds great honestly and I'm pretty picky), and I just have gotten in the habit of deleting songs I don't want to listen to again and keep my phone simply as a "fun-music" device storing about 3GB of individual songs I actually want to hear again, which I use for playing in my car via bluetooth that auto-connects when I get in and auto-plays on auto-connect. Can't beat the convenience.