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.
Length – if your callers typically wait 2 minutes at a time, then at least 2 minutes of programming should be the goal. The idea is to ensure the callers don’t hear repeated messages every time they call. A typical on-hold message is 4-8 minutes in length.

And the best part is that you don’t need to write your on hold message script to be so formal. The point of an on hold message is to keep them on the line, not to bore them to death! So, you might as well try to have some fun with it and make your customers laugh while they wait.
Broadcast positive messages about your business, which can increase brand awareness and loyalty. For example, we strongly recommend describing accomplishments, your social commitments or any other pertinent subject.