In an exclusive interview with Fortune, Apple CEO Steve Jobs discusses his company’s iTunes Music Store, a new digital service that may be the most promising legal on-line music service on the market. “This will go down in history as a turning point for the music industry,” Jobs tells Fortune. “This is landmark stuff. I can’t overestimate it.” Apple’s iTunes Music Store will allow Mac users to listen to a 30-second preview of any song and then buy a high-quality audio copy for US$0.99 with one click.