 The first video game to use a continuous background soundtrack was Tomohiro Nishikado's 1978 release "Space Invaders", which had four simple chromatic descending 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", an arcade game released by Namco in 1980, featuring a simple tune that repeats continuously during gameplay.It was also one of the earliest games to use a digital-to-analog converter to produce sampled sounds.