If you're not actively planning content for your on hold program, and, say, play the radio on hold, you're not controlling what you're playing on hold. You're at the whim of a Radio DJ or program manager, who might play music that's unappealing to your callers or who might be producing and playing ads for your competition.
Most typical on hold scripts include: “Thank you for your patience” and “Your call is important to us”.

If it is a genre, hold music, it's fair to say, is a troubled one with few hits. It's not really meant to be loved or even listened to — it's meant to communicate something specific: Don't hang up. (Cornell makes this plea specifically at the end of his song.) Silence is believed to be a death knell for phone calls — people will simply think the line is dead and hang up. This is true even on non-hold calls; it's why phone companies transmit something called a "comfort tone" over phone lines, a barely audible synthetic noise that signals a connection is still there.
Our Company, The Phoenix Pattern & Tool Co Ltd, have been customers of Birmingham Telecom since they started out. They have replaced our phone system 3 times, recently bringing us into the 21st Century. The 3CX system that we have now is user friendly and the app enables working from home much more convenient. Special thanks to Andy for always getting the right product to suit us and Shaun for the time and effort put in with us during and after the installation, Dan and Lee for attention given quickly to any of our queries. A great job, I have no hesitation recommending Birmingham Telecom.