Speaking of which, I've experienced two genuine hold audio instances which were very nearly as bad.
The first was the first few bars of The Beatles' "Help", on repeat. Now, this doesn't sound too bad, but I guarantee you that if you have to wait through it for 40 minutes because you have something critical that the company is providing, your brain will be liquefied in short order.
The second was an American company that have those peppy messages extolling the virtues of their product and support offerings interspersed with the hold music. It used to be that they would play the music for about 10-15 seconds, then give you a 10-second advert/message. Recently, they've changed it so it's more like 20 seconds of message separated by one second of music. And this company provides our core product, which breaks often.
My manager bought me pizza the last time I had to deal with that. He's gonna have to up the ante if it happens again.