Columbus Blue Jackets Fans rescue microphone-less national anthem singer.

How 'bout those Blue Jacket fans?

NHL.com: Jackets Fan Join in Anthem.

The crowd at Nationwide Arena did a great job with the anthem and Welsh tweeted his appreciation for the fans afterward.
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The scene was reminiscent of country music singer Brett Kissel's mic malfunction before Game 3 of the Edmonton Oilers 2017 Western Conference Second Round against the Anaheim Ducks. 

Video at Sports Illustrated.

Welsh tweeted a thank you to the fans after the game.

    Thank you #5thLine. Really needed you there and you came through. #CBJ
    — Leo Welsh (@LeoWelsh) January 13, 2019

This. Is. Hockey.