Does Terrence Howard have synesthesia?

Sure sounds like it.

Howard has other idiosyncratic theories about music - a former student of chemical engineering, he determines how many instruments to add to an arrangement according to mathematical principles, and claims that he sees music in visual terms. "To me, the note A is always red," he says. "E has always been blueish-green. So I'm always painting pictures with them. When you see the transition from the flute to the trumpet, to the saxophone, to the upright bass and then to the viola, that's my way of going through a rainbow."

Synesthesia is a neurologically-based phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway.

Hat Tip: Fark.