I'm right under you. But take away my first and I'm on top of you.

The first part of me is the chorus when ill, The second a cost, a payment, a bill. My two parts serve to make me whole The ground has given dawn a soul.

I kiss the wind and touch the sky, I soar high on your command. Up, down, left or right I fly, You guide me with a single strand.

I deal in numbers, but I’m not an accountant. I speak in codes, but I’m no spy. A chemist by training, precision’s my ally, you’ll find me where cures are shelved with care, guarding the balance of dosage and dare.

There's three of me: a pirate, a fabric, and a small friend's coat.