Adding a Single Audio File in WordPress
Simply click on the add media button on the post edit screen. Next, a media uploader popup will appear on your screen. You need to click on the upload file button to select and upload your audio file. Once it's uploaded, you need to click on insert into post button.
How do I embed an audio file on my website?
Embed Audio from Audio Hosting Websites
Click on Embed tab and copy the Embed Code.
Go to Posts > Add New.
Place your cursor in the post where you want to embed the audio and click on Add Media button.
Click on Insert Embed Code.
Paste the embed code into the Insert Embed code box and click Insert into post.
Click Publish once you have finished writing.