Music vs Lyrics

According to a source quoted in a SFGate article about playlists and personality, "People who were more extroverted tended to have songs in their music collection that had lots of singing ... People who leaned toward instrumental music, meanwhile, were more introverted."

Hmm, lyrics always mean more to me than a few notes strung together, and I have less than 5 lyricless songs on my HD, but no one would ever call me an extrovert.