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.
It depends on your business industry, type of callers and marketing plan. Assuming that you take a profit driven approach to using your telephone on hold messages as a marketing tool, you will want to consider changing at a minimum of twice per year, however its best to be more proactive and update more often like quarterly or even monthly. Callers love something new and refreshing (don’t we all!), particularly those that frequently call back and are placed on hold! Why not inform them them of special promotions, new products, or customer service info – there’s always something more that can be said! Make the most of your telephone’s on hold messaging infrastructure. It is an effective way to win, retain, and sell your callers on hold.

Cornell's "I'm On Hold" follows some of the industry standards, particularly around frequencies and compression, which is one of the reasons he wrote it with a country-ish melody, wanting something simple but catchy, with only a single instrument and vocals. But in other ways, "I'm On Hold" totally upends the genre by breaking the cardinal rule — that hold music shouldn't call attention to itself.
Instead of writing to inform people or to entertain them, you need to write your script as a way to create a conversation. You need to imagine what someone would say to another person and then put it on the page. Don’t be afraid if it feels like you’re talking to yourself — that just means you’re writing well.