Set Default Music On Hold for All Extensions. Log in to Account Manager. Navigate to the Phone System tab and click Music on Hold from the menu on the left side of the screen. Review the music listed. To hear a sample, click Play. When you have made your selection, click Select. This music will become the default hold music for all extensions.
2 days after ordering my Grace Message Player, it came from Amazon in perfect condition (I got prime yo!). I plugged the power cord in, and plugged the male thingy into the Grace thingy, and bam, we have had on hold music ever since. After a few minutes of music, they have a male voice come on explaining that we care but we are busy...we have not forgotten you etc etc, and then some more music, and then a female voice saying basically the same thing. I guess I could load an mp3 with some sales stuff on it, but I kind of like the neutural message that they already had on the machine. I am sooo glad I got this thing. Highly recommended. If you don't like it or it does not work, I bet Amazon would take it back, too.

So while this loss of quality is fine for regular conversations where it's just people speaking, if you're planning on piping music down the telephone line, you need to remember that the audio quality will, at best, be around 24 times worse than what you'd hear on a CD.
Website: https://www.phone.com/5-tips-using-hold-music-entertain-waiting-callers/