There's a snappy piece here on the average word count of a song. Kevin Roberts reports that "during the sixties and seventies was 176 words. Last year it exploded to 436 words. Do we really have so much more to say?"
Partly, the average is pushed up by the proliferation of rap, but also by the power of major recording artists to let rip without interference.
Since I started guitar lessons I've been much more tuned in to riffs and chords than just the words, which obviously is still raw with me as I remember Terry Christian's verdict on this.