Maybe your cell phone has much better sound than mine. But I think I'm talking about a general problem. There are many phone numbers in this world that will put you on hold for awhile, and play nice music to pacify you until your desired human picks up. Some even play my favorite sort, classical music. The music sounds nice on my land line. On my cell phone, it sounds just awful.
These days, most people on hold are listening to their cell phones. Telephone systems have to adjust to this, and play “on-hold” sounds that will come through nicely on a cell phone. It might be a good idea to abandon music altogether, and give us stand-up comedians instead.