If you are referring to the conduit your internet service provider uses, any differences would be based on speed (based on your service plan) and reliability, and not whether they use coax or fiber, although fiber can provide faster speeds overall, but those are well above what is required for music streaming. I found this:
Fiber can comfortably deliver symmetrical gigabit speeds (1 Gbps down and up) to your business. The fastest speed coaxial cables can achieve is typically around 1 Gbps down and 35 Mbps up. However, you're likely to max out at 100-400 Mbps for your download speeds, depending on your provider.