Sometimes it may happen that you want to share some music that you listen to: it can convey many more meanings and emotions than a simple text. Music is a simple language to understand and Facebook is an easy way to communicate. So, if you want to share some music on Facebook, start reading this tutorial from the first step.
Steps
Method 1 of 2: Add MP3 to Facebook Using SoundCloud
The first method assumes you have a Facebook account. You'll also need to create a SoundCloud account, but it's a very simple and straightforward method to share music on Facebook.

Step 1. Open your browser
The ideal would be to have the latest updated version.

Step 2. Go to the site
Type or copy this link into the address bar

Step 3. Sign up for SoundCloud
At the top left of the page you will see an orange "Sign up for SoundCloud" button, click on it.
A window should open. If it doesn't open, make sure you have not activated the pop-up blocker and, if so, deactivate it temporarily

Step 4. Sign up with your Facebook account
In the window, click on the button that will allow you to register using your Facebook account.
In the next screen press the "OK" button at the bottom

Step 5. Check "Accept the terms" and then click on "Register"
You must necessarily accept the terms to register for SoundCloud.
A new page will appear where you will be asked for your musical preferences. Follow the instructions and then click on the hidden “X” in the upper right corner

Step 6. Search for a song

Step 7. Share
After choosing a song, place the mouse under the title where there is an icon that allows you to share the song on Facebook.
While you are over the button with the mouse cursor, a pop-up will appear explaining the function of the button. Make sure you hit "Share"
Method 2 of 2: Add an MP3 to Facebook Using YouTube
This method is simpler. You can share the video directly on Facebook without having to create a YouTube account and without entering your credentials.

Step 1. Go to YouTube
Use your browser to go to the site

Step 2. Search for your favorite song or video
Use the search bar at the top of the page. Press Enter to start the search.

Step 3. Copy the link
After clicking on the video, copy the link to the address bar ([CTRL] + [C]).

Step 4. Log into your Facebook account
Go to https://www.facebook.com and enter your credentials.

Step 5. Post a new status
Using the address you copied as the main text of the post creates a new status. Facebook will automatically show the video.