If you were around at the time, you heard it.
Is that Harry Vanda from Vanda + Young fame?
If you mean Galaga?? .. I'm with you, .. but Space Invaders was the one that started it all.
Galaxian was the one between Space Invaders and Galaga. Had a legitimate existence between the two, but not the longevity!
Edit - a tad too obscure methinks on delayed reflection!
Let us try this one instead.