iTunes is a great program that facilitates your task of organizing the contents of your Apple devices. It is also the default program for uploading MP3 files and music tracks to your device. However, before you can sync these files, you will need to upload your MP3s to iTunes.
Steps
Step 1. Launch iTunes
You can do this by double clicking on the program icon on the desktop.
If a notification appears notifying you of new updates for iTunes, install them to make sure you are using the latest version of the program
Step 2. Add individual audio tracks to your iTunes library
From your computer's 'Explorer' window, locate the audio tracks you want to add. Then drag them into the iTunes window. This way the selected files will be imported into your library.
Step 3. Add an entire folder of music to your iTunes library
If you have this need, select the folder in question and drag it into the iTunes interface. All the tracks included in the folder will be imported into your library.
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Alternatively you can take advantage of the iTunes 'Add folder to library' feature located in the 'File' menu. This option imports all the songs in the selected folder within the iTunes library.