Are you the
Mario theme song?
Even your mother may have heard of me, I'm as iconic as who I represent.
It's an iconic theme song, and so is Mario.
Ecstasy will fill your body with glee, as you start and when my sounds I present.
The sounds make you happy because they're the soundtrack of my childhood too.
Except those who never knew the joy, of jumping through clouds or exploring underground.
Part of the Mario games, you wouldn't know the theme song if you didn't play.
Celebrated by most fanboys, they may even cry and cheer when they hear my sound.
Same as above, I had friends who learned this on the piano (and yes, so did I, at one point ;P).
Especially when you show them my original form,
Especially the original Mario theme song with all of its metallic sounding glory.
Great waves of nerds and fans alike may arise and storm.
Everybody knows the theme song!
The secret hint is
The acrostic, EEE CEG, the opening 6 notes to the theme song.
And yes, that is indeed the sound of my childhood!! :D