Listen to Should've Known Better (Karaoke Version) Version [Originally Performed by Richard Marx] online. Should've Known Better (Karaoke Version) Version [Originally Performed by Richard Marx] is an English language song and is sung by Party Peter. Should've Known Better (Karaoke Version) Version [Originally Performed by Richard Marx], from the album Karaoke Super Party, was released in the year 2017. The duration of the song is 4:10. Download English songs online from JioSaavn.