How to Add All of My Songs to My iTunes Library
The iTunes application is a digital media player that organizes and play music. The iTunes library will store all music bought through iTunes as well as any music files or songs on your computer. Once you transfer the files to iTunes, the files will automatically appear in the iTunes library.
Right-click on the desktop and select the option "Create a new folder" or "New" then "Folder."
Click the "Windows" button and type "Kind: song" in the Windows search bar. Press the "Enter" or "Return" key.
Select all of the song files listed in the results of your Windows search query. Right-click any of the selected song files and select the "Copy" option.
Double-click the new folder on the desktop. Right-click inside the open folder and select the "Paste" option.
Open iTunes. Click the "File" menu from the iTunes toolbar.
Select "Add Folder to Library."
Select the new folder on the desktop. iTunes will automatically copy the folder contents to its library.