Ana Đurić (known professionally as Konstrakta - Serbian Cyrillic: Констракта), is a Serbian singer-songwriter. Before pursuing a solo career in 2019, she rose to prominence as the lead vocalist of the indie pop band Zemlja gruva! which was founded in 2007. She debuted as a member of the less-known group called Mistakemistake in 2002, but gained initial recognition as the lead singer of the Belgrade-based band Zemlja gruva!. They released three studio albums: WTF Is Gruveland? (2010)