Method 1 - Carefully Check the Video Description & Public Comment Below
In the video description, some YouTubers will directly list all the music materials used in this video. Some may post the information at the end of the video. And you will find that many people may ask for the music names in the comments section, and some will provide the answers. So, you may identify music in YouTube videos through carefully checking the video description or ending and public comment section. This is also the most common way to find music in YouTube video.
Method 2 - Search the Obscure Music Lyrics in Google
One simple and straight way to identify the background music is to focus on the lyrics of the song. If they are clearly audible, you can Google it and get the song recognized. Google will show some similar and exact results, get your song from the search results.
Method 3 - Use Online YouTube Song Finder
Some online sites can help you quickly find song in YouTube video like "Mooma.sh", a tool to identify music in YouTube videos. You just have to copy and paste the YouTube link in the search bar on the homepage and click "Start". Then you will get the name of the song used in that particular video. In this way, you can find music from YouTube videos in several seconds.
Updated: Mooma.sh has been shutdown for no reason. Generally, most Music Recognizers rely on respective song database. Rather than waiting for the unscheduled database update, it's recommended to ask music experts on some forums or social media like Identification of Music Group, Name That Song, Tip Of MyTongue, etc., and get the timely response.
Method 4 - Use YouTube Music Finder Browser Extension/Add-on
Method 5 - Use Smartphone APP
We all have a smartphone today. So, you can also use some YouTube music identifier APPs to recognize song from YouTube such as Shazam and SoundHound. To use this service you need to install such an app on your mobile phone firstly and keep it near your computer's loudspeaker. Then play the YouTube video and the app on your phone will find music from YouTube video after several seconds.