Piano Character Facts

Piano is very loyal to his family and father, and never had doubts about his father's abilities, considering his father far greater than anything else. An example being when Shu, Mai and Emperor Pilaf thought Goku had defeated elderly King Piccolo, while Piano states that his father was much stronger than they thought.
Unlike King Piccolo's other sons, Piano was not a fighter-class Namekian and can be closer compared to young Dende on Namek with Guru, serving as his father's attendant. Throughout his whole appearance, Piano assisted his father with plans and ideas, and let Tambourine and Cymbal fight, until they were killed. Mere moments after his brother Drum's death at the hands of Goku, Piano is caught in the fight between his father and Goku, when Goku punches King Piccolo and is sent flying into Piano, wounding him. After the fight between King Piccolo and Goku ensues, Piano can be seen sinking into the rubble, which apparently kills Piano as he falls underground. 
It has never been determined how strong he actually is or if he could fight. However, he does show the ability to fly using ki, like his father.