By Brent Butterworth We travel (for pleasure, at least) to leave our world behind for a while. Still, bringing along the things we love most is often a good idea, whether they be family and friends, a beloved Chihuahua, or our jazz albums. Not long ago, portable audio meant big CD folders and boomboxes, so bringing Miles and Bird along with you on vacation wasn’t easy. But thanks to internet streaming and a new generation of super-portable audio products, getting great sound on the go today is hardly more difficult than playing a kazoo. Because almost everyone carries a smartphone now, we have…