On this week’s Acoustic Highway, a conversation with David Tamulevich, one half of the duo Mustard’s Retreat. The duo has been around for more than 30 years and locals might well remember their appearances at the Old Dominion University Folk Festival and at other local venues and festivals. David Tamulevich also manages a series of top folk artists including John Gorka who was featured on the program last month. The Acoustic Highway airs Sunday at 9 p.m. on WHRV, or listen online