Seksendört (also known as Grup 84) is a Turkish pop rock band from Ankara. It consists of Tuna Velibaşoğlu, Erdem Ocak, Serter Karadeniz, Okan Özen. The band was formed in 1999 but they started getting noticed under the name 'Seksendört' in 2005. The band that was influenced by bands and artists such as Moğollar, Athena, Erkin Koray, Duman, Mor ve Ötesi, Mavi Sakal, Vega, Bulutsuzluk Özlemi, Yeni Türkü, maNga, became very popular in Turkey with their album K.G.B.