Learning to read "square notes"

Have just pored over a quick tutorial on how to read "square notes" or neumes used for notating ancient sacred music. Interesting and useful stuff.

I used to search the Internet for sheet music of traditional Latin chants to be sung during mass and would be deeply disappointed if I could only find chant music written in chant notation because I wasn't familiar at all with the strange notation. Happily for me that will no longer be the case from now on.