In 1998, "Yellow Submarine" was for a re-release, thirty years after it first appeared. Movie and recording technology had improved greatly over the years, and both the producers and Apple Corps, the Beatles's company, did not want the movie to seem old or outdated. They put much work into the remastering. The original version had been in sound. Most movie theaters now had Surround Sound, and the producers wanted to upgrade the sound if they could.