A 14-year-old boy with brittle bones has become an international rap star - after he was forced to give up playing the piano because his fingers would fracture.<br /><br />Talented Sparsh Shah has amassed more than 10 million video views online and is soon set to perform for 20,000 people at Madison Square Garden.<br /><br />The teenager was born with Osteogenesis Imperfecta, a rare genetic condition which impacts bone formation and causes them to fracture at the slightest touch.
