Just about any artist on earth — whether they support the habit by bartending or inhabit the shrinking ranks of million-sellers — will tell you their goal is to have freedom to follow their muse. Darrell Scott’s a rare example of total freedom going right. He’s got enough heavyweight cuts under his belt that he’s bound to end up in the Songwriters Hall of Fame sooner or later. But he also makes albums that seem creatively satisfying; a surprisingly soulful covers set three years ago, a confessional double album last year and a back-to-his-roadhouse-country-roots effort due in a couple months. Then there’s his role in Robert Plant’s Americana dream team Band of Joy, and folk-meets-classical collaborations with the Nashville Ballet and the Nashville Chamber Orchestra. With this show, Scott will continue in the latter vein, flanked by a string quartet led by equally multitalented violinist David Davidson.