ScoreRight

From R.K. Frantz Software Inc.:

Scores can be written by adding notes directly to the staff or through a midi device connected to your computer. You decide how you want to write your score!

Add repeats, create different endings and sections using standard notation and ScoreRight will play back your score just as you've written it. ScoreRight can read and write standard midi files, so you can play your scores on any computer or device which supports the midi file format.

ScoreRight even lets you add dynamics, lyrics and guitar chords to your composition!

Tools allow you to create your own chord symbols, build melodic styles, transpose scores and more! You can work on more than one score at a time, copying and moving notations easily between scores. You can even compose multiple voices on one staff, or compose a piano score using 3 staffs. Compose a full orchestra score and let ScoreRight automatically arrange the instruments by group and type.