Casey Aaron Cooper (born 27 September 1991), known on YouTube as COOP3RDRUMM3R, is an American drummer best known for his drum covers, original songs and drum lessons to the YouTube community. He is currently the third most subscribed drummer on YouTube. With an average of 850 subscribers and 190,000 views gained per day, he gains the most subscribers and views among the all YouTube drummers as of January 2015.