The violinist spent two days visiting pawnshops and music stores in Billings this week; meanwhile, police examined surveillance footage from the airport.
The violin, an 1879 instrument built by Eugenio Praga, is worth about $50,000, according to the Gazette.
The TSQ blends classical music with jazz, bluegrass, rock, and other genres. The group won a Grammy Award this year in the classical crossover category for 4 + Four, a collaboration with the Ying Quartet.