#20 By Ear

Learn to sing in harmony. By ear.  Listen to duets, trios, quartets, or quintets, such as The Gaithers Vocal Band, The Heritage Singers, Selah, King's Heralds, The Isaacs, Acappella, and many more.  Listen to their vocal runs over and over again.  Sing along.  Follow each part.  It will do you more good for decades to come than hundreds of hours trying to read music and sing along.  It allows to improvise, develop your own style of harmony, and even switch parts.  Develop a love for harmony.