EXCLUSIVE: Michael McDonald’s long-lost son reveals stunning moment he discovered famous father after 58 years

EXCLUSIVE: Michael Goessling always knew he was adopted. But what he did not know for nearly 58 years was that his biological father had one of the most recognizable and beloved voices in American music.

The St. Louis man learned recently that his father is five-time Grammy winner and Doobie Brothers singer Michael McDonald, a musician Goessling had admired since childhood and had unknowingly paid to see perform twice as a young man.

But even after receiving the letter that began it all...