Each Yamanote stop has a unique melody and the line is bright green. Other Tokyo lines have their own colors and jingles.
Memorize the colors: Yamanote (green), Chuo (orange), Sobu (yellow), Marunouchi (red), Ginza (orange), Hibiya (silver). Saves time at giant stations.
Google Maps and the Japan Transit Planner app both show real-time delays and platform numbers.