Who is Gordon Lightfoot?

Many Grey Cup viewers asked this question on Twitter during the Canadian singer's halftime show performance Sunday night.

Lightfoot, 74, kicked off the set with a performance of his 1967 hit "Canadian Railroad Trilogy," while younger acts Marianas Trench, Carly Rae Jepsen and pop phenom Justin Bieber waited in the wings.

Toronto blogger Matt Elliott was quick to point out this trend, tweeting, "Despair, Canada. Despair." Elliott also attached a screen grab of some "Who is Gordon Lightfoot?" tweets.

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One user, @kianadelury wrote, "who the **** is this gordon lightfoot, I just want me some Justin bieber." She later posted, "Gordon is cute though."

Lightfoot is an internationally-renowned Canadian signer-songwriter, best known for his folk and folk-rock hits like "If You Could Read My Mind" and "The Wreck of the Edmund Fitzgerald."

CFL commissioner Mark Cohon told the Canadian Press last week that he planned for the 100th Grey Cup halftime show to get "new and young Canadians into the game."

"The decision was strategic in making sure we get young people to think about the next year, and the next 100 years," said Cohon. "This is about getting a new audience into the Grey Cup and the CFL."

At the very least, from the looks of those Lightfoot-related tweets and the associated mentions of Bieber or Jepsen, the CFL successfully attracted a younger audience with their halftime show picks.

A similar take on this "Who is..." Twitter trend happened earlier this year, when astronaut Neil Armstrong died in August.

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  • Toronto Argonauts players celebrate with the Grey Cup after defeating Calgary Stampeders in the CFL Grey Cup championship football game on Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Nathan Denette)

  • Toronto Argonauts players hold the Grey Cup after defeating the Calgary Stampeders in an CFL football game, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Ryan Remiorz)

  • Toronto Argonauts center Jeff Keeping holds the Grey Cup after defeating Calgary Stampeders in the CFL Grey Cup championship football game on Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Nathan Denette)

  • Toronto Argonauts kicker Swayze Waters holds the Grey Cup after defeating Calgary Stampeders in the CFL Grey Cup championship football game on Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Nathan Denette)

  • Toronto Argonauts running back Chad Kackert waves after being named the MVP in the the CFL Grey Cup championship football game against the Calgary Stampeders, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Paul Chiasson)

  • Calgary Stampeders' Edwin Harrison, from left, Jon Gott and Obby Khan react after losing the CFL Grey Cup championship football game against the Toronto Argonauts, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Nathan Denette)

  • Ricky Ray

    Toronto Argonauts quarterback Ricky Ray looks downfield during first-quarter CFL Grey Cup championship football game action against the Calgary Stampeders, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Ryan Remiorz)

  • Calgary Stampeders quarterback Kevin Glenn reacts after a fumble against the Toronto Argonauts during the first quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Ryan Remiorz)

  • Toronto Argonauts' Chad Owens celebrates in the end zone after scoring a touchdown against the Calgary Stampeders during the first quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Nathan Denette)

  • Kevin Glenn

    Calgary Stampeders quarterback Kevin Glenn looks downfield during first-quarter CFL Grey Cup championship football game action against the Toronto Argonauts in Toronto, Sunday, Nov. 25, 2012. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Calgary Stampeders running back Jon Cornish rushes the ball against the Toronto Argonauts during the first quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Frank Gunn)

  • Pacino Horne

    Toronto Argonauts cornerback Pacino Horne celebrates his touchdown with teammates against the Clagary Stampeders during the second quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Ryan Remiorz)

  • Brandon Smith Ricky Ray

    Toronto Argonauts quarterback Ricky Ray, left, is sacked by Calgary Stampeders defensive back Brandon Smith during the second quarter of the CFL Grey Cup football game, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Frank Gunn)

  • Dontrelle Inman

    Toronto Argonauts wide receiver Dontrelle Inman celebrates his touchdown against the Calgary Stampeders during the second quarter of their CFL Grey Cup football game, Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Graham Hughes)

  • Toronto Argonauts linebackers Ejiro Kuale and Brandon Isaac celebrate a tackle against the Calgary Stampeders during the second quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Charleston Hughes; Ricky Ray

    Toronto Argonauts quarterback Ricky Ray is sacked by Calgary Stampeders defensive lineman Charleston Hughes during the second quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Frank Gunn)

  • Justin Bieber performs during the half-time show at the 100th CFL Grey Cup game between the Toronto Argonauts and the Calgary Stampeders Sunday, Nov. 25, 2012 in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Justin Bieber

    Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders Sunday Nov. 25, 2012 in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Gordon Lightfoot

    Gordon Lightfoot performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Justin Bieber

    Justin Bieber performs during the half-time show at the CFL Grey Cup championship football game between the Toronto Argonauts and the Calgary Stampeders Sunday Nov. 25, 2012 in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Carly Rae Jepsen

    Carly Rae Jepsen performs during the half-time show at the 100th CFL Grey Cup game between the Toronto Argonauts and the Calgary Stampeders Sunday, Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Toronto Argonauts running back Andre Durie celebrates his touchdown against the Calgary Stampeders with Chad Owens during the fourth quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Toronto Argonauts running back Andre Durie celebrates his touchdown against the Calgary Stampeders with Chad Owens during the fourth quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Sean Kilpatrick)

  • Calgary Stampeders quarterback Kevin Glenn is sacked by Toronto Argonauts defensive tackle Kevin Huntley (94) and defensive end Ronald Flemons during the third quarter of the CFL Grey Cup championship football game, Sunday Nov. 25, 2012, in Toronto. (AP Photo/The Canadian Press, Ryan Remiorz)