Click the menu bar "Edit"--"Preferences"--find the "Advanced" tab. There is a "Copy files to iTunes Media folder when adding to library" checkbox.

Click "Music" under "Library" in the left navigation bar.

If you directly click "Find Music Files" in the right interface, iTunes will All Mp3 and AAC music files are found and automatically added to the list.

Find the file directory on your computer that stores the music you want to import, and select the music files you want to import. For example, to select the first, third, and fifth songs, you can hold down the Ctrl key and click once with the mouse. The first, third, and fifth songs. After selecting, right-click on one of the selected songs and select "Copy" or hold down the Ctrl and C keys at the same time.

Then return to the music interface you saw in the second part of iTunes and hold down the Ctrl and V keys at the same time. In this way, the selected song list is added to the iTunes music library.

This is successful, and the songs are transferred to the Apple phone through iTunes.

When Apple was founded, it mainly developed and sold personal computers. As of 2014, it was committed to designing, developing and selling consumer electronics, computer software, online services and personal computers. Apple's Apple II fueled the personal computer revolution in the 1970s, followed by the Macintosh, which continued in the 1980s. The company's hardware products mainly include Mac computer series, iPod media players, iPhone smartphones and iPad tablets; online services include iCloud, iTunes Store and App Store; consumer software includes OS X and iOS operating systems, iTunes multimedia browser, Safari Web browser, and iLife and iWork creative and productivity suites. Apple is world-renowned for innovation among high-tech companies.