“We become what we repeatedly do.” ~Stephen R. Covey Cher won’t stop singing “Dark Lady” inside my head. The pop tune was released in 1974 but happened to be playing on my car radio last week. Now it repeats itself on an endless loop in my mind while I’m brushing my teeth each morning. Then it starts all over again, later, while I’m making dinner in the kitchen. What is it with sticky songs? According to my online research, sticky songs (otherwise known as “earworms”) have a scientific label: Involuntary Musical Imagery, or INMI. “According to the first large-scale study of earworms, such songs usually have a faster tempo, a…