Promoting a service or a product can be achieved in many ways:
An integrated marketing campaign using many tools of the marketing-mix or perhaps a specific launch event. The option that would best suit you all depends on your objectives.

Website clips are being used more and more to promote a product or service.

If you are the product i.e. a performer/singer why not use a showreel clip on your website which can be updated regularly as your portfolio grows.

This would demonstrate to prospective clients your ability to perform and entertain in many different genres of music and venues.

Visual, moving pictures with voice over can be a much more captivating form of communicating with your audience. Take a look at the show reel and make up your own mind how video can work for you.