Listen to Harp Duet: I. Introduction online. Harp Duet: I. Introduction is an Instrumental language song and is sung by Olga Erdeli and Tatiana Shchepalina. Harp Duet: I. Introduction, from the album Olga Erdeli, Harp, was released in the year 1986. The duration of the song is 9:17. Download Instrumental songs online from JioSaavn.