I think @Bazzz and @JohnGB hit the nail on the head. I would add that if you still want to have a jingle/sound play that you give the user complete control of that sound. For example you could have a movie playing in the background (or a paused movie with a play button), and give the user the ability to unmute/play it if they want. That way, the video sound is not bugging them while they are not viewing the website/tab, but catches their attention while they are on the website.

I think @Bazzz and @JohnGB hit the nail on the head. I would also encourage you to not try to sell them once they are on your site. Instead help them buy. They are already there, and unless they see something that interest them, a nice jingle won't get them to come back. Jacob Nielsen put this best when he said the following;

Even though it does little good to run ads on other sites, there are many ways in which the Web can be used fruitfully in marketing. Most important are corporate websites where an entire site can be devoted to promote a company's products. Such sites should not be sales-driven but should focus on customer support and service, including detailed product specs and supporting information to facilitate the buying process. In other words: help customers buy; don't try a hard sell.

I would encourage you to read his entire article on advertising here.