|...and this is not a pipe.|
Like, playing with people is just the true arena for learning music, and being a musician. That's where everything happens. If you're not doing it, there's not much to say about it except, “start doing it now, even if you suck at it. Especially if you suck at it.” And listening: there's nothing to say that's going to replace, or assist in, actually parking it in front of the stereo with some records on a regular basis. To be a musician you have to do those two things a lot, and there's no way to talk, study, or practice your way around them.