It's a panoptic experience, being on hold while listening to someone singing about being on hold. Depending how long it takes for someone else to join the call, you could be listening for awhile. The music builds as time goes on, culminating in a spoken verse that begins: "Well, let me tell you all a story / about a man who was on hold all day..." This unusually self-aware song is the default music for a conference call service called UberConference, where "I'm On Hold" plays on a loop for anyone who calls in early, on almost every call that doesn't start exactly when it's scheduled to (or doesn't ever start at all). It's selected by nine out of ten call organizers, and plays over a million times per month, says Craig Walker, CEO of Dialpad, owner of UberConference.
The intro greeting should be a reassurance that the caller has reached the correct organization along with general information about the company, and information that you want the caller to have on hand. Good information to provide at this point might include organizational slogans, years in business and general product information.

All our customer service advisers are busy. Due to currrent high volume of calls, it may be some time before an adviser is able to take your call. either continue to hold or press 1 and leave your details and we will call you back later today.
Don’t miss out on an opportunity to educate and entertain your callers (bundled with the possibility of making that extra sale, which is always a plus). You can utilize on hold messages in a variety of ways to get engagement from your callers and to ensure they feel in control. All it takes is the right script, the right voice, and habitual updates dashed with a little bit of creativity.