Heart-Rest:
The others have given you links to some wonderful traditional Catholic music, so I will give you some other resources.
Because the function of this music to transport both us and our prayers to a more spiritual level, the proper setting to experience it is at Holy Mass.
This link http://www.ecclesiadei.org/masses.cfm will help you find a Traditional Latin Mass in your area.
It takes about 4 Masses to really understand what is going on at the altar. This video (The Most Beautiful Thing This Side of Heaven), with accompanying Latin-English missalette, is a great way to introduce yourself to the Latin Rite:
http://www.ecclesiadei.org/Videos%20and%20DVD’s.htm
Like the Novus Ordo Mass, the TLM has fixed parts (the Ordinary) and parts which change with each day (the Proper). The prayers and music for the TLM are prescribed by the Liber Usualis (the 1961 Edition can be downloaded as a pdf file here:
http://www.sanctamissa.org/en/music/gregorian-chant/choir/liber-usualis-1961.html
This is a dauntingly large book and is used by those who sing the Mass (priests as well as schola cantorum). The section on Gregorian Chant is dense but will give you the background on understanding the neumatic musical notation and how chant is sung.
This website also has great resources about the TLM (click on the “home” tab and explore the website.)
If you want more music, the Ordinary and Proper music (sheet music and recordings) can be found here:
Ordinaries: http://www.ccwatershed.org/kyriale/
Propers: http://renegoupil.org/
I hope you find these links useful.
Thanks for all these resource links you provided. It’s another goldmine to check out. I appreciate it.