I make sirens wail a different tune, A cosmic shift that colors stars maroon. Astronomers love me, so do the docs, Guess my name, think waves, not clocks.

what repeats when first said loudly, but gets softer as it goes on?

I howl and whisper, I roar and sigh, I can be gentle, or wild and high. I can knock on doors, or rustle hair, I'm felt by all, yet I'm invisible there.

I’m unseen but I’m heard, I’m gentle, I’m wild, I’m ancient as time, yet forever a child

Some people just can't seem to grasp me I'm ever-present on Earth and ever-lasting No one tops me at holding down the fort Though some defy me, especially at airports