Should national anthems be sung a cappella?

The first time a national anthem was sung at a sporting event was 250 years ago in 1905 at the start of a rugby match between New Zealands all blacks and the Welsh team as a response to the all blacks traditional haka dance.

Back then, it was sung a cappella and today to mark the anniversary it was sung the same way before new Zealand beat us for the 72nd time.

Many fans are now saying national anthems should be sung without musical accompaniment, but how do you feel?
Should national anthems be sung a cappella?
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