The problem, in my mind, is that every single one of these articles misses the point completely. Even if you implemented a call centre system that detected and automatically played someone’s all-time favourite music while they waited, a facility which is possibly not that far off, most music when played down the phone just sounds terrible. Butchering a song that someone actually likes is unlikely to improve the waiting experience.
It is vital that you put your most important messages first, it’s all about interest and impact. It is a ‘Fact’ that 90% of callers put on hold without dialog or music will hang up within the first 40 seconds and 34% of those callers will be lost forever. Callers stay on hold up to three times longer with on hold messages.

Hold music is one of those subjects that unites people from all walks of life. No matter where you’re from or what your background is, the prospect of five minutes listening to poorly chosen music while your telephone gradually makes a painful imprint on the side of your head fills everyone with a justifiable sense of dread.
5.0 out of 5 stars Solved our royalty-free hold music problem It works perfectly as advertised and solved our royalty-free hold music problem. When it arrived, we installed it with our office telephone system and have never needed to worry about it again. It has such a wide selection that callers get different music every time they call - it does not noticeably repeat. We even got a few compliments from clients in the first month (who had apparently got tired of our old 45-second repeating loop). Terrible product, will not work at all I have purchased 2 of them hoping it was a glitch but neither work, in addition I called support, no help at all, said they would call back-never did.