The problem with a telephone connection is that it doesn't have the proper bandwidth for music. Telephones have a bandwidth of about 3100 Hz (300 Hz to 3400 Hz). With that, you will lose the fidelity of the low notes and the richness of the harmonics. That is why “hold music” sounds so muddy and muffled when you are put on hold. I bet it’s virtually impossible to tell a great sounding ukulele from a cheap plywood one over the phone.