TL;DR:
This guide explains several effective ways to refresh iTunes library when songs, playlists, or media files are not updating properly.
If your newly added songs, playlists, or media files are not showing up in iTunes, your iTunes library may need to be refreshed. Refreshing the iTunes library helps iTunes reload and update its media database, allowing missing content to appear correctly again. This issue can happen after transferring music from an iPhone, restoring a backup, changing file locations, or syncing with Apple Music.
Fortunately, there are several easy ways to refresh or rebuild your iTunes library on both Windows and Mac. In this guide, we will walk you through the most effective methods to refresh iTunes library and fix common library updating problems quickly.

One of the easiest ways to refresh your iTunes library is to manually re-add your music files or folders to iTunes (How to Transfer Music from iPhone to iTunes Library?). This method helps iTunes scan your media files again and update the library database. It is especially useful when newly downloaded songs, transferred music, or missing tracks do not appear in iTunes automatically.
Steps to Refresh iTunes Library Manually:

After the process is complete, check whether the missing songs or playlists now appear correctly in iTunes.
If you use Apple Music or iTunes Match, enabling or updating iCloud Music Library can help refresh your iTunes library automatically. This method forces iTunes to sync your music collection with Apple's cloud service and reload missing songs, playlists, and album information. (How to Add Music to iCloud Storage?)
Steps to Refresh iTunes Library via iCloud Music Library:

After syncing is complete, your updated music library should appear correctly across your devices.
If iTunes is not updating properly, you can try reopening the program with a keyboard shortcut to force it to reload or rebuild the library database. This method is quick and can help fix minor library loading issues without changing your music files.
Steps to Refresh iTunes Library with Keyboard Shortcut:On Windows:
On Mac:
Once finished, check whether your songs, playlists, and media files are displaying correctly again.
Sometimes, refreshing the iTunes library still cannot fix missing songs or music sync issues. In this situation, you can use Coolmuster iOS Assistant to export and back up iPhone music directly to your computer without relying on iTunes. This tool makes it easier to organize your music files and keep an extra backup of important songs on your PC or Mac. Besides music, it also supports managing photos, videos, contacts, messages, and other iOS data in a simple and user-friendly way.
Key Features of iOS Assistant:
Download Coolmuster iOS Assistant to have a try.
Here's how to move music from iPod to the computer in 1 click via iOS Assistant:
01 Download and install Coolmuster iOS Assistant on your computer, then launch the program.

02 Connect your iPhone to the computer with a USB cable. After the device is detected, click "Music" from the left panel.

03 Preview and select the songs you want to save, then click the "Export" button to transfer them to your computer.

A video guide about how to use iOS Assistant to transfer music from iPhone to computer for your reference:
Q1. Why is my iTunes library not updating?
This problem can happen if iTunes cannot locate your music files, the library database is outdated, or iCloud Music Library is not syncing properly. Restarting iTunes or rebuilding the library often helps.
Q2. Will refreshing the iTunes library delete my music?
No. Refreshing the iTunes library normally only reloads or updates the database and does not delete your original music files.
Q3. How do I refresh Apple Music in iTunes?
You can refresh Apple Music by enabling "Sync Library" or "iCloud Music Library" in iTunes Preferences and then restarting the program.
Q4. Can I rebuild an iTunes library?
Yes. You can reopen iTunes with keyboard shortcuts like "Ctrl + Shift" on Windows or "Option + Command" on Mac to rebuild or reload the library database.
Q5. Why are some songs missing from my iTunes library?
Songs may disappear if the original music files were moved, deleted, or stored in a different folder location that iTunes can no longer access.
Refreshing your iTunes library can help fix many common problems, such as missing songs, outdated playlists, or media files not appearing correctly. Whether you manually reload your library, update iCloud Music Library, or rebuild the database using keyboard shortcuts, these methods can quickly get iTunes working normally again. If you continue experiencing sync or music management issues, using a professional tool like Coolmuster iOS Assistant can make exporting and organizing iPhone music much easier without relying completely on iTunes.
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