I’m still pissed at Google for buying and then killing rather than integrating Songza. The only thing we kinda got from that was the moods radio in Google music.

Most ripping software I've used allow to throw in a link to a playlist. I started off by ripping a playlist or two from spotify and then adding albums as I buy or otherwise aquire them. Getting started is a bit of work, but once you get over that, the rest is easy. I now have about 238 hours of music on my phone and my desktop after a year or so of doing this.