Listen to I Don't Know, But I've Been Told online. I Don't Know, But I've Been Told is an English language song and is sung by Military Workout. I Don't Know, But I've Been Told, from the album Prepare for Basic Training: Military Cadences from a Real Drill Instructor, was released in the year 2013. The duration of the song is 1:51. Download English songs online from JioSaavn.