When you work with a professional audio production company, that uses legally licensed music and professional voice over talent and has experience editing audio for telephony applications, the sound quality is going to be much better than something put together by an amateur or something you've recorded and thrown together yourself. Professional audio production is very cost-effective, and you'll get a big bang for your buck by going professional.
Statistics show that approximately 34% of callers who hang up will never call you back. In addition, callers wait an estimated 70% longer on the line when they are listening to interesting information about the company they are calling. These statistics suggest that providing a customized message that is tailored to your company can be more effective than playing music or leaving the customer in silence while they’re on hold.

Verbal Content – generally, you should use 100 words to make up 1 minute of content produced with background music. In other words, one to two paragraphs per minute. The topic can range from product promotions to general company information.
Make sure to check your phone system for any file requirements. The most common file format accepted is WAV. If you need to convert an audio file, you can use services like G711 or Audacity. Read More: 5 Ways to Get Customers to Love Your IVR Menu. How to choose the best hold music for your business. For telephone hold music, simple is best.