Adding sadness the WRONG way in your music

Adding a sense of sadness is a common desire for writers of music. Sometimes I like doing this as I play the organ for the congregational singing in Sacrament meeting. But there's definitely a WRONG way to do it. A way that would confuse the congregation. Or worse, destroy the reverence of the moment. The standard add-a-little-sadness technique is what we call "borrowed harmony." But beware of 2 possible pitfalls. Allow me to explain. The basic idea of "borrowed harmony" happens when you're...