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Music notation software (there are lots to choose from) create a file which can be imported into a graphics program and resized, cropped, optimized etc, then uploaded to your image directory and used in the HTML of the page mark-up. I also have scanned music, and followed that same process.
.GIF files work well since music is usually black and white. However, if you wish to offer sheet music downloads, the PDF format is the way to go.
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