Gradual changes
In addition, there are words used to indicate gradual changes in volume. The two most common are crescendo, sometimes abbreviated to cresc., meaning "get gradually louder"; and decrescendo ordiminuendo, sometimes abbreviated to decresc. and dim. respectively, meaning "get gradually softer". Signs sometimes referred to as "hairpins" are also used to stand for these words (See image). If the lines are joined at the left, then the indication is to get louder; if they join at the right, the indication is to get softer. The following notation indicates music starting moderately loud, then becoming gradually louder and then gradually quieter.
Why it related?
It is easy.....decrescendo is a symbolic that describe my life.........Recently i become more mature..not like before ....r u think so?When i'm still young(since when i'm old?) i hardly to control my anger and always yell at my friends..but now i think i've change....i become more.....sentimental.....this is the word i can describe......hope everyone clear now and i hope you all can share your opinion and idea with me since i am new in blog....ok...bye aneyo =)