What is happiness?

Wikipedia says this: http://en.wikipedia.org/wiki/Happiness

To some it may be what's portraited on this picture: http://static-p3.fotolia.com/jpg/00/05/44/28/400_F_5442891_1CRcGg77ZcYfPxEIVkUq2oWwE6u4LqeD.jpg

To every person it means something different, but to me, at least at this moment, happiness equals to composing :D

What does mean happiness to you at this moment?