It's true, when you think about it. I posted a comment on this article by Shawn at The New Liturgical Movement.
First, this comment, by "Un Seminariste":
Strumming immediately calls to mind more secular forms of music -- folk, for example. Classical guitar, on the other hand, where the musician is playing melodies embellished with chords and arppeggios, etc., is quite beautiful and, I think thereby, more suited to liturgy.
To which I replied:
Bingo! A classical guitar can work, almost as well as a harp, IMO. I can see it in some of the more mystical works, especially where a harpist cannot be secured, or a harp cannot be transported.A folk guitar, OTOH, leads to strumming in most cases. And even finger-picking a set of steel strings can lead to the "folk ballad" effect, as opposed to that mystical effect when plucking the nylon strings of a classical guitar.I personally don't believe in the hum-strum guitar at Mass, but I would have absolutely no problem with the adding of a classical guitar (e.g., supplementing a piece that has, let's say, a soft organ accompaniment like the 8' string celeste), at least where it could serve a particular piece well, and played with proficiency.
I could picture the Grail/Gelineau setting of Psalm 40 ("Here am I, Lord, I come to do your will") accompanied with perhaps 8' and 4' flutes only on the antiphon and an 8' string celeste stop on the verses, supplemented by a classical guitar, and it would probably sound pretty dang good. Same with the Peloquin "If today you hear his voice", from his "Lord of Life" Mass and his "Songs of Israel, Volume 2" collection. It would have to be nylon strings, however, to serve the proper effect in these two examples.
Can we say: nylon strings - good, steel strings - bad?