I've been seriously dedicated to meditation for three years now. (I've given up keeping track now, it is so ingrained in my life.) And I've been playing my guitar since I was 11 and seriously practicing it since I was 18.
Here's what I notice about the practices of meditation and guitar playing:
The enormous life-changing skills of presence, awareness, focus, concentration, letting go ... these are what I work on in tiny increments everyday in my meditation practice (10 to 20 mins in the morning and, when I am at my best, at least 10 minutes in the afternoon).
When I bring these skills to the woodshed (a jazzers term for "practice room") and to the time I spend with my guitar on my lap, I notice that I learn better, I am more calm and less overwhelmed by all the I still want to be able to do on my instrument. My guitar practice sessions are more focused, less scattered. There is a glow and restorative aspect to this time. My mind is refreshed and still. This is new for me. Before, my practice session were always, basically, demoralizing -- showing me only how far I had to go and how painstakingly, achingly, terribly slow my progress was, if I wasn't backsliding, which I often felt like I was.
Learning to see that meditation is a way of practicing my guitar and that practicing guitar is a kind of meditation has made both activities exponentially more gratifying and deep.
There is a rich and satisfying inner life to my guitar work now that I am sure was always there somewhere, but I could never see it. I was moving too fast, trying too hard, too attached to what I couldn't do, hadn't done.
My friend the great saxophonist and human John Ellis once mentioned to me that he felt he needed his time in the practice room with his saxophone everyday as a way to stay grounded and sane. At the time, I caught his drift -- that he meant that his practice was, spiritually, more than just practice.
I -- finally -- get it.