The steps to listen to songs with the music player that comes with the iPhone are as follows:

1. When the iTunes software on the computer is ready, please connect the iPhone to the computer and open the iTunes software.

2. When 2.iTunes recognizes the iPhone, please click the phone icon in the window at this time.

3. Find the option of "Manually manage music and videos" in the right window, and then click the "Apply" button.

4. Please click the "Music" option under the "Equipment" column on the left side of the window.

5. Next, find the music files you want to download to iPhone on your computer, select them and drag them directly to the Music column of iTunes window.

6. Then turn on the music on the iPhone. You can see the music downloaded by the computer in the song list and play your favorite music.