Mükemmel (Perfect) is the eleventh studio album by Turkish singer Hande Yener. It was released on 2 June 2014 by Poll Production. After working with Sinan Akçıl on her three previous studio albums, Yener ended her friendship with Akçıl and after it became evident that the two would not work together on any projects again, in May 2013 she released the new single "Ya Ya Ya Ya", which was written by Berksan. Following the single's release, she began working on her new studio album, and after years she took new songs from Altan Çetin with whom she had worked on a number of her early albums. Alongside Çetin, Mert Ekren and Volga Tamöz joined the album's personnel as songwriters. Mükemmel is a pop album with elements of electronic music. After "searching for an ambitious name", Yener eventually titled the album after one of the songs in the track list. While the album's release date was changed several times, the final delay happened following the death of hundreds of miners due to the Soma mine disaster. Due to the huge number of songs in the album, it was decided that it should be released as a two-disc edition. Yener also performed new versions of the songs "Bir Köşede Yalnız" and "Kış Masalı" for the album, both of which were previously released and performed by Ajda Pekkan and Sezen Aksu respectively. On the song "Unutanlar Gibi", Mehmet Erdem appeared as the featuring artist. "O Kadın Gitti" was the only song in the album that was written by Yener herself. Music critics wrote generally positive reviews for the album and praised the "innovation and experimental works" in it. Mükemmel ranked third on D&R's Best-Selling list in Turkey and, according to MÜ-YAP, it sold more than 50,000 copies. Three separate music videos were released for the songs "Alt Dudak", "Naber" and "Hani Bana", the first of which ranked second on Türkçe Top 20, while the second one rose to the third position on the chart. Mükemmel received the Best Album award at the Golden Objective Awards organized by the Magazin Journalists Association. In April 2015, the album was again released under the title Sebastian + Mükemmel. It was a three-disc edition, the first of which contained Yener's new single "Sebastian" and three other songs which she had performed for other albums. Many of the songs in the album were later included in Yener's compilation