Adrian Claudiu Sînă, better known as Adrian Sina or simply Adi Sina, is a Romanian singer-songwriter, record producer, radio DJ and entertainer. He is best known for creating, producing and singing in the dance group Akcent and also for writing and producing mainstream hit songs for himself and other international artists. He started out as a disc jockey in the 1990s and then created a group with his fellow musician Ramona Barta. He came to prominence as a member of Akcent with the song "Ultima vară" in 1999. His group was joined by Marius Nedelcu, Sorin Brotnei and Mihai Gruia. Together they scored multiple number-one hits both in Romania and throughout Eastern Europe, especially in the mid- to late 2000s. Their albums have been certified multi-Platinum by the Uniunea Naţională a Producătorilor de Fonograme din România and millions of copies were sold worldwide. Their signature song was "Kylie", released in 2005.
In the early 2010s, Sina decided to embark on a solo career and co-opted various recording artists on his side. He started his own record label, Premium Artist, and recorded some solo hits, such as "Hold On", "I Can't Live Without You" and "Angel".