The first part of the green concerto which includes blue, green, and yellow. The concerto is a symbolic representation one's passage through life. Concerto: A musical composition for a solo instrument or instruments accompanied by an orchestra, esp. one conceived on a relatively large scale. Each part has a theme blue(sad), green(neutral), and yellow(happy) the progression of mood is not linear, as the progression of life is not linear.There are some sad songs in yellow and some happy songs in blue, as there is always joy to be found in the dark times and always sorrow to be found in good times. All in all Yin and Yang motherf@*kers its all equal in the end; its all green.