Roman Catholics know the modern music of Haugen and Haas but do not know the music of Palestrina or Josquin des Prez. They have memorized the words to Eagle's Wings but do not recognize Ave Verum. They dance to "I Am the Lord of the Dance" but stare blankly at the sound of Gregorian chant. Check out the hymnals and missalettes of the last generation or two and you will find that much if not most of the music is twentieth century in origin.
But Roman Catholics are not the only ones. Check out the ELCA's Evangelical Lutheran Worship hymnal published in 2006 and you will look in vain for many of the great Lutheran chorales or the familiar strains of Scandinavian hymnody. In place of these, you find a very large number of twentieth century music (and not a little Haugen and Haas). Fortunately the Lutheran Service Book has even increased the number of Lutheran chorales and great hymns from our past -- but not without complaint among some.
What was thought to be a relatively benign introduction of more "up beat" sounds and modern lyrics has proven to be a radical disconnect with a whole tradition. One wag (HT to Touchstone) has taken the Dies Irae and adapted it to lament the state of church music in Roman Catholic Churches today. BTW the original was in TLH, adapted translation of Irons, number 607.