Richard Rice continues to do amazing things with his editions of music, most recently publishing a book of Magnificat antiphons in English, tunes drawn from the Gregorian tradition and shaped by his own experience as a singer and composer.
I highly recommend not only this book but all his editions of music, each of which is structured to give the liturgy more beauty and nobility.
Here is one O Antiphon from his new collection. As you can see, this is parish accessible.