Add background music to VSL or not?

Once the music is not distracting it would work just fine. There is a reason
why movies use sound tracks. Your challenge will be to get the music to
match the mood of the copy.

-Ray Edwards

I think it depends on the music you use

Here's one example where it can be quite effective:

https://fast.wistia.net/embed/iframe/dlgm31vz78

Look at the most commercially successful websites. Does Amazon play music automatically? Does Facebook? Does Ebay? Does Google? What about Yahoo, or IMDB? The answer in all cases is no. Why? Because they’ve done their research (they can afford to, after all). And their research told them it was a bad idea. Isn’t it great that you can benefit from this research without paying for it? Moreover, There is no music that all of your visitors will like. Not everyone likes Mozart, not everyone likes Metallica, and relatively few people like elevator ambient background music. For every visitor that comes to your site and thinks “cool” there will be at least one who will think “ick!” and never return.

There's many facts why you shouldn't put music on your website, I could write here for hours!

So, the answer is NO!

Actually more than 60% people will choose the background Music. But you must use the good & relative background music. So you need to careful to choose the music. Thanks for your advance.

Thank you very much for the advice - All advice taken on board.

C'mon guys, be wise.

A visitor might be listening to a quiet classical CD using their PC with headphones. They click to your site, which then adds a hip-hop beat to the mix at four times the volume, making their ears bleed. Hitting the back button and remembering your site name takes less time than finding your wierd-looking "stop" or "pause" button. You'll never see that visitor again.

Or.

Someone may be using their laptop in an open-plan office without headphones, and may have forgotten to mute the sound. Your site may be relevant to their needs, but if the music that suddenly blares out embarrasses them or annoys their colleagues (or worse still their boss), you can bet they won't visit again or recommend you to others.

Or.

With tabbed browsing, it's often convenient to middle-click several search engine results and then flick through them. If your site is one of those results, and it starts playing music, and your visitor doesn't want that music, they have to flick through the tabs until they work out which site is offending them. You can bet they'll close that tab. And imagine what happens if two of the websites they clicked start playing music - a horrible cacophany that will have your visitor reaching for their browser's "Exit" button.