Singer Heidi Merrill and three songwriters gathered trial Wednesday in the federal court in Manhattan and claimed that she created a song in 2016 called "Game On" and put it to Underwood's producer Mark Bright, who went on.
Merrill claims that Underwood's same-name song, "Game On," which was played during the opening of "Sunday Night Football" 2018, is a direct copyright violation of the song she sent to the nation's superstar team a year before.
"This is a blatant attempt by a celebrity singer to tear off the work of other artists, and it will not be tolerated," Merrill's lawyer Sam P. Israel said in a statement to CNN. "It is irresponsible to steal music created by hardware songwriters and then broadcast the theft on national television."
A representative of NBC Sports said the network did not comment on ongoing disputes.
CNN has reached out to Underwood and the NFL.
Below is Merrill's song, which the suit says she uploaded to YouTube in 201
This is Underwood's "Game On" from "Sunday Night Football" last year.
The trial seeks unspecified damage that is determined by trial.