The Words to Your Favorite Song

Tonight I was grading and listening to music...I heard a Regina Spektor song that spoke the words I couldn't find on my own...

It's like forgetting the words 

To your favorite song

You can't believe it

You were always singing along

It was so easy

And the words so sweet

You can't remember

You try to move your feet

It was so easy

And the words so sweet

You can't remember

You try to feel the beat