The problem is that the LYRICS OF MODERN SONGS AREN'T SOUND.
Drums aren't sinful. But pandering and failing to produce God-centered lyrics IS!
Oh, yeah? Listen to Third Day. Listen to Andrew Peterson or Caedmon's Call - if those aren't Reformed, I'll eat my hat. Try not to feel inspired by Third Day's reworking of classic hymns, try not to cry when listening to Andrew Peterson's "The Silence of God".
I'm not saying use them in church services, mind, although they all sing a few songs that sound enough like hymns you could slip 'em past the old ladies. But don't deny that they can bring people closer to God. If I'm driving along the highway, I want to rock out, and I'd rather "rock out with Jesus" than to death metal.
Such a broad statement without examples is not helpful.
Here are some lyrics from a song done by Third Day, one of the groups mentioned in the article. Please tell me what you consider to be "unsound" in these lyrics.
Holy, Holy, Holy, are you, Lord God Almighty. Worthy is the Lamb; Worthy is the Lamb; Worthy is the Lamb. You are Holy, Holy, Holy, Amen.