Listen to If I knew (Acoustic) (Karaoke Version)[In The Style Of Bruno Mars] online. If I knew (Acoustic) (Karaoke Version)[In The Style Of Bruno Mars] is an English language song and is sung by Karaoke Universe. If I knew (Acoustic) (Karaoke Version)[In The Style Of Bruno Mars], from the album The Best Karaoke 2016, was released in the year 2016. The duration of the song is 3:49. Download English songs online from JioSaavn.