Back in 1952, as part of a class of 33 in the now defunct Snow High School in Ephraim, he was the one student the music teacher asked to please lip sync the song at graduation.
"I'm tone deaf," shrugs Mac.
He was thus as shocked as that music teacher would have been when the late Gordon B. Hinckley, then president of the LDS Church, called him into his office 10 years ago and asked him to replace Wendell L. Smoot as the Tabernacle Choir's president.
"But I can't sing," said Mac.
"Oh, we don't want you to sing," President Hinckley quickly rejoined.