What are your "WOW" moments in audio?

[CatManDo]

The first time hearing a CD in my (modest) hifi system, back in 1986.

 

Infinity RS6 speakers, Kenwood C1/M1 amps, Philips CD100 player.

 

The track was "Leave it" from the Yes album "90125", with the artificial bass synth effects alternating between both channels . My Dual turntable couldn't produce anything similarly impressive.

 

Of course this was required to create a wow effect on a 18 year old, not natural timbre,  microdynamics or precise imaging.