MuseScore lets you notate and compose music easily with your keyboard, your mouse or a MIDI keyboard. You can print the beautifully engraved sheet music or save it as PDF or PNG. You can play your score, transpose it, and save it as audio or MIDI file. MuseScore also supports MusicXML to let you share your composition with other scorewriters. MuseScore is free and open source.
What's new in this version:
Version 1.2 includes 100 bug fixes, mainly in MusicXML import and export, notation, user interface, playback, styling and parts.