Yalın’s album “Ellerine Saglik” sold 200,000 copies within first week and reached 500,000 copies at the end of 4 months.
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He started writing music for commercials first for Kargo’s 2000 commercial for Efes Dark, a product of Efes Beverage Group.
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In 2006, Çeliköz produced Yalın’s second album “Bir Bakmissin” which received favorable critiques and high sales numbers.
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In 2000, Çeliköz with his bandmate Selim Ozturk take the lead in directing and guiding Asli, Turkish Rock Singer, through her first solo album “Neresindeyim”.
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In 2004, Çeliköz also played keyboards in debut album of Yalın, Turkish pop singer.
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Çeliköz and Selim Ozturk, co-producer of Yalin’s albums, are credited with producing highest selling records for Yalın.
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Towards the end of 2008, Serkan Çeliköz and Koray Candemir decided to end their involvement with Kargo due to vision and opinion differences with the other members.