These songs are all the lyrics that are the most commonly used by people on the internet. The words describe how people are feeling, and the melody plays over the song to help the viewer to feel the same way.
The songs that I use are all on the same page, so I can’t really say it all. It’s just the way I’ve been learning to play guitar since high school.
In general, the more commonly used words tend to be more poetic and descriptive. The reason I use this particular song in my youtube videos is because it describes how people are feeling. The melody is pretty generic and the lyrics don’t really change with the mood. It’s the same as any other song, so I can’t really say that it’s the most popular song.