If you are looking for a way to write and print music and don't have a bundle of money I recommend that you check out and try Muse 1.0
I needed a way to add some customized piano exercises to give to my personal students and found a link on this site to a free version of Muse 1.0
Down loading it was easy. No hassels and no extra tool bars or other gimmicks were added to the download.
There is a version for both Windows and Mac users.
Once the program was up and running I began to experiment with writing some simple charts.
The program was fairly intuitive and the built in manual and online help were easily available when I had a specific thing I wanted to accomplish.
With in an hour I was able to create several exercises by useing the mouse to add and edit note imformation.
You can use a MIDI interface as well to enter note info from a keyboard.
Note: the MIDI keyboard enters one note or chord at a time. This mode of note entry (often called "step-time entry") is fast and reliable. Some notation software tries to interpret "real-time entry" where the musician plays a passage and the software tries to create the notation. However the results are frequently unreliable even when played by a skilled musician using expensive software. MuseScore's focus is on more reliable forms of note entry.
I was able to save my exercies as jpeg, png or many other formats so that I could print and publish them easily. I used paint to enlarge and tailor them to my needs.
Muse uses whatever internal sound card to play back and you can write parts for a multitude of instruments.
Another cool thing is that you can wirte drum parts and percussion notation as well so it will function as a sort of drum machine.
Muse 1.0 did every thing I wanted to do at the time and then some and the best part of it is that it was Free!!