How to transfer music from mac to iphone?

I want to transfer my music from my mac to my iphone 4

Plug the USB cord into your Mac.go to iTunes.click sync. And select the songs you want to put after the sync is done.

1. Click the "iTunes" icon in the Dock on your Mac to launch the application.
2. Connect your iPhone to a USB port on your Mac using the iPhone's included USB cable. Your iPhone will appear as an icon in the left side of the "iTunes" window.
3. Click "File," and then click "Transfer Purchases From (name of your iPhone)." All music you downloaded from the iTunes Store directly to your iPhone will now copy over to your Mac. Click "Purchased on (name of iPhone)" in the left side of the iTunes window to see the music that transferred over.
4. Disconnect your iPhone from your Mac when the transfer is complete.

Use iTunes