Metronome for designating visually the note of music to be played

Abstract From the Canadian patent

An optical metronome using sheets of music of nonsagging sheets of translucent material with notes spaced according to their value and vertically aligned measures on a display panel of light columns formed of vertical bars of triangular cross-section in white reflectors with an angular air gap and a light source for each bar. Circuitry coordinates sequential lighting of the bars in proper musical tempo and properly placed downbeat and is also attached or attachable to electronic organ circuitry or stands alone with automatic turnoff of lights to the bars if organ not counting.