On-hold music is considered standard in business phone systems today because people actually perceived wait times as shorter when they hear it. On-hold music traditionally worked by having specialized equipment attached to the phone, and the jack might plug into the radio, then tapes, then CDs, then MP3 players. PRI boards are built with jacks to play on-hold music.
The best hold music has few instruments and preferably only one. Simple music handles the change in quality better than a full orchestra arrangement. The latter gets distorted, particularly if it’s too loud for the phone to handle and clipping happens. No one wants to hear a dirge-like cacophony masquerading as “Pachelbel’s Canon in D.”

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