"All music was "contemporary" at one time, no matter how old or young it may be. What matters is how it touches the heart and soul of the listener."
So true. And it is gracious to accept that what touches my soul may not touch another's, and vice versa. Sadly there is a lot of musical snobbery attached to much criticism! 

"Whether it's contemporary, traditional or ethnic music, Wisler said the goal is to encourage congregational singing."
It is unfortunate that this not always the goal of musical directors who favour 'concerts'; while the music/concerts of choral groups can be truly uplifting, it is not participatory and I do feel participation is important in worship, particularly the Mass.