Cubs fever infiltrated the Bank of America Chicago Marathon Sunday.

Bystanders rang cowbells and sang songs like “Shake it Off” while cheering on friends, relatives and some of the world’s most elite runners.

But when a certain tune played, it was as if somebody shouted, “More cowbell!”

The crowd roared with approval as speakers blared with “Hey, Hey, Holy Mackerel, no doubt about it, the Cubs are on their way!”

Some appreciative Texans at the race said they admired Chicago’s spirit and beauty.

“The buildings look like you could reach to the sky,” said Elwanda Campbell, who was at Roosevelt and Michigan to cheer her grandson, Cody Simmons, a 40-year-old lawyer from Friona, Texas.

“Everybody has been really, really helpful and really friendly,” said Simmons’ mom, Cindy.

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Another group near the finish line came to support Black Girls RUN! About 50 members were running from Chicago and another 10 from Indianapolis. Cheryl Miller, 51, a Chicagoan who lives in Indianapolis, carried signs that read: “Bada– Women Run Marathons,””#BGRStrong,” “You Got This” and “One Foot in Front of the Other.”

The group’s motto is “No Woman Left Behind,” said Danielle Oaldon, 37, also of Indianapolis. “No matter if you’re a runner, walker or even a crawler, no woman is left behind.”