Hello how may I help you? I need to know the most serious of info. okay. how can I help? Whats the best selling music record? Pink Floyd's the Dark Side of the Moon was the top selling in the world. Michael jackson's Thriller was the top selling in the USA Are you sure it's not Bob Doles Christmas Classics? No Bob Dole's Christmas Classics never made the list I guess I was wrong, thanks records-bot! You're welcome. Need more info? No. Take care! Have a good day!