Thank you for calling {COMPANY NAME}. You will be assisted shortly. Please note that all calls are answered in the order they are received.
source: Is it possible to have music play on my droid razr if i put sombody on hold?

Music on hold helps you increase retention, reduce churn, and even influence your caller’s attitude with hold music. Go on, get your elevator music jokes out. We’ll wait (and chuckle). We’ve all poked fun at Muzak, but the importance of hold music and its multifaceted nature may surprise you. Seventy percent of business calls go on hold. The main point behind hold music is to signal that the line is still open, but that’s not all it does. You can increase retention, reduce churn, and even influence your caller’s attitude with hold music.
The decision to update your on-hold message depends largely on the content you are sharing. If you are sharing content that includes short-term promotions, this information will need frequent updating so consumers are always aware of the status of any offers. However, if you’re only sharing general information about your standard products, your operating hours and location, then the decision to update the message can be more reliant on metrics.