This is an original idea I have been trying to find an electronic door bell but they are not ideal. This one will Knock on the door and give you a polyphonic chromatic it is also ideal of an electronic alarm or call waiting I doubt if there is another one anywhere killing two birds with one stone, Synth Loops,
A progressive mix of rock and electronic music, with a dark but somewhat hopefull/resolve feel. Starting at a slow tempo the song quickly evolves to a mid, to up tempo feel, providing the initial mood an uplifting element, to finally emphasize initial statement with a slow rhythm/inst. section. Instrumental, Science Fiction, Alien Invasion