The Irish hockey anthem is usually Ireland's Call, but not for the Olympics.
Ireland's first appearance at the Games as an independent nation (they last competed in 1908) caused confusion amongst viewers before the action even started.
During the national anthem for their Group B opener against India, Amhrán na bhFiann played for the Irish team who are used to hearing Ireland's Call.
https://twitter.com/nealerichmond/status/761924763665170436
During the build-up to the game, RTÉ commentator Ger Canning also introduced the Irish anthem as Ireland's Call, before Amhrán na bhFiann was belted out through the Rio skies.
https://www.youtube.com/watch?v=e_K_vubqWZ0
And it caused a lot of confusion because the fans wouldn't have been too used to it.
https://twitter.com/UCCExpress/status/761925065919332353
So they made sure Ireland's Call was heard anyway.
https://twitter.com/UCCExpress/status/761925590878396417
But the questions were still being asked.
https://twitter.com/austinstacksabu/status/761924614121525248
https://twitter.com/hookhockey/status/761924676625072128
https://twitter.com/JohnWLanders/status/761924720153522176
https://twitter.com/LukePField/status/761924812298133504
https://twitter.com/Aoife1108/status/761925084386910208
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https://soundcloud.com/sportsjoe-gaa-hour/michael-murphy-on-enjoying-the-game-duffys-flawed-proposal