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Audacity is a free program that record and edit audio on your PC, including the music coming from your favorite movie and video players. To download Audacity, go to https://www.audacityteam.org/download in your computer's web browser, and then do the following:  Click Audacity for Windows. Click the Audacity 2.3.2 installer link to download the file. Double-click the installer file. Follow the on-screen instructions to install Audacity. If Audacity doesn't open automatically, open Start {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/07\/Windowsstart.png","bigUrl":"\/images\/thumb\/0\/07\/Windowsstart.png\/30px-Windowsstart.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}, type audacity, and click Audacity in the search results. It's near the upper-left side of Audacity and usually has MME selected by default. A drop-down menu will appear. This option sets Audacity to record sound from other apps, such as those that play music or videos. It's to the right of the microphone icon that's right of the "Windows WASAPI" box. Selecting it ensures that Audacity will capture your computer's internal (on-screen) audio without recording external audio (e.g., your typing). If the audio you're listening to is currently coming through headphones, you'll click Headphones (loopback) here instead. To ensure that your audio is captured without distortions and feedback, follow these steps:  Click the Transport menu. Click Transport Options. Remove the check mark from "Software Playthrough" if its present. If there is no check mark, there's no need to make any changes. It's near the top-left corner of Audacity. Audacity will begin recording the audio coming from apps on your computer. It's best to do this after beginning your recording—you can always trim down the beginning of the recording to account for dead space as needed. It's near the top-left corner of Audacity. This is the menu near the top-left corner of the app that currently says "Windows WASAPI."  This will change back the audio output and input options so that you can play your recorded audio. It's the green {"smallUrl":"https:\/\/www.wikihow.com\/images\/2\/22\/Android7play.png","bigUrl":"\/images\/thumb\/2\/22\/Android7play.png\/30px-Android7play.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of an Android icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} button at the top of the Audacity window. This will play the recorded audio through your computer's speakers (or headphones). To save your file:  Click the File menu in the top-left corner of the window. Select Export. Click Export as MP3 (or your desired format) in the menu. Select a save location. Enter a file name in the "File name" text box. Click Save. Click OK when prompted.

Summary:
Download and install Audacity. Open Audacity. Click the audio host drop-down menu. Select Windows WASAPI. Click the audio input drop-down menu. Click Speakers (loopback). Disable Software Playthrough. Click the red circle to start recording. Play the audio you want to record. Click the Stop  button to stop recording. Switch the "audio host" menu back to MME. Click Play' to listen to your recorded audio. Save your recorded audio.