When Parker was 15, he met 14-year-old Shawn Fanning over the Internet, where the two bonded over topics like theoretical physics and hacking. A few years later Fanning and Parker cofounded Napster, a free file-sharing Service for music. Parker raised the initial $50,000, and they launched Napster in June 1999. Within a year, the Service had tens of millions of users. Napster was opposed by recording labels, the Recording Industry Association of America, and the heavy metal band Metallica, among others. Lawsuits by various industry associations eventually shut down the Service. Napster has been called the fastest-growing Business of all time, is credited with revolutionizing the music industry, and is considered by some to be a precursor to iTunes.