Quilly, originally known as Quilly Millz, began his music career in Philadelphia as a rap battler before transitioning to releasing mixtapes under his shortened name in 2013. His debut mixtape series, Haines Street Hustler, and the New Wave series helped establish his reputation. Quilly gained national attention with his hit single "Real One" in 2014 and a viral Hot 97 Funkflex Freestyle in 2015, further solidifying his presence in the industry. With co-signs from notable figures like 50 Cent, DJ Cosmic Kev, and Lil Uzi, Quilly continues to make a name for himself in the music scene, particularly in Philadelphia where he has been a prominent figure for a decade.