Film your commercial using a video camera or webcam, or put together your PowerPoint presentation by combining various photos with your audio jingle.
Here are 12 tips to help put your music in commercials by writing great jingles. What do you want to become? For example, say your client really likes this one song, and that song relies heavily on acoustics. Let the product suggest your ideas.
And the next demo you record will be that much stronger. Determine the tone you want for the music you will write. I suggest using something like RandomAmazonProduct.
This is often accomplished by combining a short message with a catchy tune that people are likely to remember. Consider the key happy, sad, mysterious, etc.
A rhyming dictionary may be helpful at this stage.