RGB MusicLab is a computer application for MacOS and WIndows. It is a musical instrument and a composition tool of RGB (Red, Green, Blue) colors. The demo video shows a playing harmonies of a pixel and a music of New York Subway Photographs. You can find a color as a harmony, and a mosaic image as a musical score.
For a composition, you can drag-and-drop a JPEG or PING image onto a right panel of RGB MusicLab. Select a musical instrument of each color, a tempo and a note length. Then click on "Create RGB Music".
RGB MusicLab reads RGB value of pixels from the top left to the bottom right of an image. One pixel makes a harmony of three notes of RGB value, and the length of note is determined by brightness of the pixel. RGB value 120 or 121 is the middle C, and RGB value 122 or 123 is added a half steps of the scale that is C#. Pure black that is R=0, G=0, B=0 is no sounds.
RGB Music creates a moving image of playing RGB Music and its document. A background color suggests a harmony of the playing color. You can see a moving image of a sample music in the demo video.