All I Need (A Riddle)

I have stems that shoot out from top and bottom

I can make you feel both happy and solemn

The only color I wear is black

You always read me from front to back

Thin rows of lines puncture my every move

When I enter a room, I can’t be removed

I cannot speak, but I still create noise

I am something everyone enjoys

Without me, the world would be completely lost

I can be created without any cost

Everyone enjoys me, I cannot lie

So please, guess now, just what am I?

(answer: music)