So what can we do to avoid inflicting further musical misery on our own customers while they’re patiently sitting on hold? We could just go back to playing a ringing sound, or an intermittent beep just to let people know they’re still connected, but that would be awfully dull. The best compromise is relatively simple electronic music that doesn't have too much going on as the ideal choice for hold music as it requires far less refined sound quality to get a decent rendition down a telephone connection.
The word “Ringback” is perhaps unfairly associated with a niche market of cell phone users. A ringback tone is a signaling tone that the caller hears while the phone is ringing. In America, the tradition has been to have a two second tone with a four second pause, mirroring the two second ring and four second pauses on the other end.

-Customers left on-hold without any background music felt that a 30-second on-hold call actually lasted 90 seconds. Furthermore, customers thought a 30-second on-hold call that used music-on-hold last only 15 seconds.
No one calls customer support to chit chat. They call because they have a problem and are likely irritated enough to get on the phone and ask about it. Odds are they’re not alone, so there’s a bit of a wait before your team can answer. If you were answering support calls, what would you want your frustrated customer listening to in the moments before you pick up?