Musical instruments may not be sold on Sunday.

Title 53 – Sundays, Holidays and Other Special Days
CHAPTER 1.
SECTION 53-1-60. Sale of certain items on Sunday prohibited.

The sale or offer to sell the following items on Sunday is prohibited: Clothing and clothing accessories (except those which qualify as swimwear, novelties, souvenirs, hosiery, or undergarments); housewares, china, glassware, and kitchenware; home, business and office furnishings, and appliances; tools, paints, hardware, building supplies, and lumber; jewelry, silverware, watches, clocks, luggage, musical instruments, recorders, recordings, radios, television sets, phonographs, record players or so-called hi-fi or stereo sets, or equipment; sporting goods (except when sold on premises where sporting events and recreational facilities are permitted); yard or piece goods; automobiles, trucks, and trailers. No inference shall arise from the foregoing enumeration that either the sale or the offering for sale on Sunday of items or articles not mentioned is permitted.