Stoyan Yankoulov (Bulgarian: ????? ???????, born 10 September 1966), also known as Stundzhi (Bulgarian: ???????), is one of Bulgaria's most popular and renowned drummers and percussionists.
Yankoulov formed the duo Elitsa & Stoyan to represent Bulgaria in the Eurovision Song Contest 2007 in Helsinki, and once again they represented Bulgaria in the Eurovision Song Contest 2013 in Malmö.