The search for this specific title primarily yields fan-made . It is likely you are looking for one of the following:
There is no official collaboration titled "Bir Gün" by featuring Gazapizm . Muslum Gurses Feat Gazapizm Bir Gun
Another iconic Gürses track often used in rap remixes and featured in modern media (like the Çukur series, where Gazapizm also had music). The search for this specific title primarily yields fan-made
An original Müslüm Gürses solo track released in 2000 on the album Zavallım . Muslum Gurses Feat Gazapizm Bir Gun