Answer:
Tickle with your fingers and a song it will sing. Be careful, though, you may break a string. What is it?
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
Four kings of whom I am one lord. Often on deck but never on board. Though I have a large heart, I am always seen at war. During which I always wear a suit, but never a suit of armor. Who or what am I?
What occurs four times in every week, twice in every month, only once in a year but never in a day?
It's shorter than the rest, but when you're happy, you raise it up like it's the best. What is it?
People take me on walks and I run and have fun. What am I?