What Are Some Hot Videos on YouTube?

As of August 2015, hot videos on YouTube include "Gangnam Style," by Psy, "Blank Space," by Taylor Swift and "Roar," by Katy Perry. These are three of the most popular YouTube videos.

South Korean performer Psy released "Gangnam Style" in July 2012. The energetic song and its video immediately experienced massive success. This video ultimately garnered over 2.3 billion views. Musically, "Gangnam Style" exemplifies South Korea's up-tempo K-Pop style.

Taylor Swift's official video for "Blank Space" has also achieved over 1 billion views. Released in November 2014, this hit song capped Swift's journey from country radio dominance to broader mainstream success. Swift penned "Blank Space" with Max Martin, a Swedish songwriter with who has written or helped write 21 number one hits.

Martin also co-wrote Katy Perry's "Roar," a pop-rock song released in August 2013. The video for "Roar" has amassed 1 billion YouTube views, making it the fifth most popular YouTube video to date. "Roar" is characterized by a pop sound with arena rock influences. The song's video shows Katy Perry wandering through a colorful stylized jungle and interacting with animals. The popularity of this video helped drive sales for Perry's "Prism" album, which has sold over 4 million records around the globe.