Can i put music in an iphone?

Can i put music in an iphone and i'm talking about an iphone that already has music on it, i want to put more music on it but without deleting the music thats on it,
can that be done?

BEFORE you plug your phone into the computer and open iTunes, just go to the computer and open iTunes, and SHUT OFF anything about automatically synching - use MANUALLY add music. This way, you are in control. You can add without erasing automatically. Once you have this all set, THEN plug in your phone. Also check your phone, though, that you have nay *automatic* things shut off. It is frustrating at first, but you will figure it out, and then you will be fine - we're.

Do what Mamianka said however you will still lose the previous music if you haven't synced your device to the computer before. You will have to pull the music from your idevice.
Just use Syncios to copy music from iPhone to computer: http://syncios.com/version-compare.html
And then follow this steps for manual music: https://support.apple.com/...s/HT201593