One of the reasons I'm happiest about the reception of the Hymn Tune Propers project is its flexibility. Instead of having to "buy in" to one particular tune, or one particular instrumentation, the local parish musician is able to do as s/he likes, tailoring the tune to a particular congregation's needs.
One example of such customization is here. A music director in Ontario--where I've never been--has chosen O Waly Waly as the tune for the Hymn Tune Introit. Try singing it through. I think you will agree that it is as accessible and congregation-friendly as any gathering song in the book.
Many thanks to Attila Jagodits for setting this, and for sending it to me. It is so gratifying to see these at work in parishes.