Okay. What are the highest strength/weight ratio materials? Some carbon variation, most likely. Boron fiber is cool, too. I tried a fly rod made from that stuff once. It's incredibly stiff and very strong.
But I doubt if music wire is going to be om the mix. At the extreme, in the finest diameters, its ultimate tensile strength can range up to 460,000 psi. In the thicker sections, around 1/8" dia., it's around 200,000 psi. But, being steel, it's heavy.