The line that Ludwick was heard singing -- from a tune called "Behind These Hazel Eyes -- was: "Here I am once again."
That was ironic, because the veteran outfielder appeared in 38 games for Pittsburgh last season after being acquired from the San Diego Padres at the July 31 Trade Deadline.
When what he was singing was called his attention, Ludwick laughed and said: "I didn't realize that. It's just what happened to be on the radio."
Ludwick, who signed with Cincinnati as a free agent in February, was in the starting lineup on Saturday, batting seventh and playing in left field.
"I love it here. They have a good team," Ludwick said of the Reds. "I think it's a team good enough to make a postseason run. Obviously we've got to play 162 games, and we got off to a slow start, but we've been playing pretty good baseball as of late and I really like our chances."