Francis Albert Sinatra, arguably the biggest entertainer of the 20th century, would have been 100 years old Saturday. His life has been studied and dissected 1,000 ways. But when it’s all said and done, the Sinatra legend is built on his music. Bill Zehme wrote the best-seller “The Way You Wear Your Hat: Frank Sinatra and the Lost Art of Livin’” based on extensive interviews with Sinatra — the last ones he gave before he passed away in 1998. He joins us to talk about his favorite Frank tunes in honor of the singer’s centenary, along with Morning Shift director Jason Marck.