Gammer is the stage name of Matthew Lee, a British DJ and producer from Northampton, England. He began releasing music in the early 2000s and became associated with UK hardcore and happy hardcore, later broadening his sound into hard dance and bass music. He is known for energetic DJ sets and productions that blend hardcore with dubstep, trap, and other electronic styles. His catalogue includes releases on labels such as Monstercat and Essential Platinum, and he co-founded the hardcore-focused label Together We Rise. His track “The Drop” became widely played in festival sets, and he has appeared at major dance events as a live DJ.