Why can't I read the Sheet Music?

If you cannot read the music, the most likely reason is System or Browser Compatibility. Yamaha MusicSoft uses the NoteFlight viewer to view sheet music. The Noteflight Viewer is the world's leading HTML-based sheet music viewer, providing interactivity and auto-responsiveness for use on any device, including computers, tablets and smartphones. Interactive files include playback, tempo control, transposition, variable note sizes, and full screen viewing. The Noteflight Viewer includes realistic MIDI playback with expression, stereo and reverb and works seamlessly within desktop and mobile browsers.

SYSTEM REQUIREMENTS
You may use the following operating systems on your desktop or mobile device:

Windows XP, Vista, Windows 7, Windows 8, Windows 10
Mac OS X 10.6 or above
iOS 6 or above
Android 2.3 or above
Chrome OS
Linux
BROWSER COMPATIBILITY
For score display and downloading, the following browser versions are supported:

Chrome 21 or above
Safari 6 or above
Internet Explorer 9 or above
Firefox 14 or above
iOS Safari 6 or above
Android 2.3 or above
For audio playback, the following browser versions are supported:

Chrome 36 or above
Safari 7 or above
Firefox 36 or above
iOS Safari 7.1 or above
Android (none)