While this allowed for inclusion of music in early arcade video games, it was usually monophonic, looped or used sparingly between stages or at the start of a new game, such as the Namco titles "Pac-Man" (1980) composed by Toshio Kai or "Pole Position" (1982) composed by Nobuyuki Ohnogi. The first game to use a continuous background soundtrack was Tomohiro Nishikado's "Space Invaders", released by Taito in 1978. It had four descending chromatic bass notes repeating in a loop, though it was dynamic and interacted with the player, increasing pace as the enemies descended on the player. The first video game to feature continuous, melodic background music was "Rally-X", released by Namco in 1980, featuring a simple tune that repeats continuously during gameplay. The decision to include any music into a video game meant that at some point it would have to be transcribed into computer code by a programmer, whether or not the programmer had musical experience. Some music was original, some was public domain music such as folk songs. Sound capabilities were limited; the popular Atari 2600 home system, for example, was capable of generating only two tones, or "notes", at a time.