This week’s column highlights two bands occupying vastly different spots on the roots music spectrum: Pink Martini’s polished, multicultural world music and Greensky Bluegrass’ imaginative version of bluegrass as played by a scruffy jam band. The inclusion of Pink Martini may rustle a few feathers, but I view the Roots of Bluegrass Music family as an inclusive one, continually expanding its boundaries. This music isn’t unique to any one country or to anyone’s particular sensibility. You can color me green, blue — and pink.