No matter which kind of company you call — big or small — their on-hold music usually sounds like it has been recorded in a tin can. You would think that with modern technology being able to clone sheep and fly humans around faster than the speed of sound, that a creating a business phone system with clear and crisp on-hold music would be easy. But as it turns out, it isn’t so straightforward.
source: Is it possible to have music play on my droid razr if i put sombody on hold?

Before we get into “Step-By-Step Guide to Custom On Hold Messages” it’s important to understand the value of having custom on hold messages for your brand. Business has always been done over the phone, and callers have always been put on hold, but as online shopping has surpassed brick and mortar traffic, over-the-phone sales have reached all time highs. A recent study by Marchex shows that Americans spent more than $1 trillion in mobile “click-to-call” commerce, and there was over 93 billion consumer-to-business phone calls from smartphones and this number is expected to grow to a whopping 162 billion by 2019, 70% of callers are placed on hold 62% of callers hang-up in less than 45 seconds 34% of callers who hang-up will never call back.
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