Answer:
I am an instrument capable of making numerous sounds but cannot be touched or seen. What am I?
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I love to twist and dance. Though wingless, I fly high up into the sky. What am I?
I am the signature stroll of ducks and penguins
I hold two people together but touch only one. What am I?
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.