I always use gregorio for any project. Not only does it almost automatically create correct chant scores (without needing to worry about following many of the various conventions), but for someone (like me) who is coding oriented, it's by far the quickest way too.

In addition to that, the code can be shared very easily and used, making it very open source friendly. I wouldn't do it any other way,

He probably meant to include this link:
http://illuminarepublications.com/gregorio/

That's a nice on-line interface to the gregorio software. You won't need to install any software on your machine.

My less fancy web interface for running gregorio is at
http://gregorio.gabrielmass.com/

But before you use those, you can read the tutorial on using Gregorio:
http://home.gna.org/gregorio/tutorial/tutorial-gabc-01

I used Gregoire, but it's a very old program at this point - probably 8 or 9 years. And I haven't been writing much in the last couple of years. The other options have improved a lot.

I only need small snippets for leaflets and programs so using Illuminare Score Editor is perfect for what I need.
For modern notation or chant notation you can load the Saint Meinrad fonts onto your computer and simply type them in using your favorite document editor.

@March Cerisier: I'm actually starting to use InDesign, is the Caecelia font free? Do you import of a staff or how do you write your music on InDesign?

@donr: THANKS! that is pretty much straight-forward font

thelon

Here is my inDesign drag and drop chant method. This is 1 of 3. The others are there on youtube if you find the first one useful enough.

http://www.youtube.com/watch?v=gYp2Xg3dyMA&feature=youtube_gdata_player

I started with InDesign + Caeciliae. After setting chant pieces that spanned several pages though, I found that I was spending more time correcting layout and pagination than I was on the chant itself. So I wrote my own layout program...my screen looks like the attached screenshot when setting chant: 1) write the chant in a gabc-like format; 2) run it through the layout engine; 3) place the generated images/PDFs in InDesign for publishing.

The major reason I didn't go with gregorio was mostly personal...I don't enjoy working with TeX, I wanted more control over the layout than I had with gregorio, and I just wanted to tackle the problem of chant layout for the fun of it. When gregorio started using the Caeciliae glyphs back in 2008, I nearly just went with it. In the end though, I needed some other features than I couldn't accomplish with gregorio, so I'm still using a custom solution for now...

Gregorio for chant, Finale for the rest. Lilypond is okay, but not as flexible for formatting as Finale is for my purposes - which may be influenced by my long time use of and corresponding familiarity with Finale.