Historiddle

Can you figure out who our rhyming riddle refers to? This Pittsburgh legend was born in 1921 and on March 27th, 1950 made his debut as a solo artist on the concert stage, Self-taught, he started performing regularly on KDKA when he was only 7 years of age, He’s also remembered for a landmark album entitled “Concert By the Sea”, As well as a song whose first line includes the phrase “I’m as helpless as a kitten up a tree”.