I've been playing electric for a couple years now and I started playing upright about a year ago. It's a challenge, but I really love it. What I don't love is how non-portable it is. I'm thinking about getting into something a little more portable, an instrument to take out on the porch or to the park to play. For what it's worth, I play and listen to pretty much everything under the sun: jazz, blues, classical, funk, rock, bluegrass, and so on. I was thinking about either mandolin or violin, but I wanted to ask what TBers have chosen to play on the side. Do you have another instrument (or several) that you play besides bass? What are they, and why did you choose them?