This is the 9543rd most frequent Turkish word.
albümünü
"The album of (his/her/its)" or "his/her/its album."
In this sentence, 'albümünü' is the direct object of the verb 'tanıttı' (introduced). It uses the possessive form with the accusative case, indicating that the album belongs to someone specific (Ahmet in this case) and is the object of the action.
Ahmet geçen hafta yeni albümünü tanıttı.
Ahmet introduced his new album last week.
Here 'albümünü' functions as the direct object of the verb 'gönderdi' (sent). It uses the possessive suffix indicating that the album is of the artist along with the accusative case to designate it as the object of the action.
Sanatçı albümünü dinlememiz için bize gönderdi.
The artist sent his album to us to listen to.
In this interrogative sentence, 'albümünü' is again the direct object of the verb 'yaptın' (did you make), with the possessive form showing that the album belongs to the person being questioned and the accusative case indicating the focus of the action.