Jack Brickhouse

.1948 April 16 WGN airs its first Cubs game, White Sox defeat the Cubs 4-1 in an exhibition game. Jack Brickhouse announces the game with Bert Wilson doing the play-by-play.

1970 May 4 Ernie Banks hits his 500th HR of ML career off Pat Jarvis in a 4-3 win in 11 innings over the Braves at Wrigley Field.
Grab video link from May page

Jack Brickhouse Wikipedia page