How are your bodily fluids today? Too much black bile? Not enough phlegm? Ridiculous questions today, but in medieval times, people believed that there were four fluids that ruled our moods. Depending on the mix, you were choleric, phlegmatic, melancholic, or sanguine. Carl Nielsen ran across four comical paintings based on these four temperaments, and based his Second Symphony on them. We'll hear it, from a concert by the San Francisco Symphony.