Phones nearly always have better cameras than tablets so, if you have a phone and a tablet of similar quality, try the phone first.  If you have an iPhone 5 upwards or above, a S4 or above or equivalent, you should get excellent results as long as you follow the instructions.  If you are using a high end phone and you are not getting excellent results, look above or on the ‘How to use’ page where there is lots of advice.

On the camera screen, tap the ‘?’ button and swipe through the tips for taking a perfect sheet music photo.

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Note that most recognition failures are due to insufficient light, poor focus or an image not square on the screen.  Photograph the music vertical, but make sure its flat.  Daylight is ideal.