Listen to I Don't Know Why (I Just Do) (Remastered) online. I Don't Know Why (I Just Do) (Remastered) is an English language song and is sung by Dean Martin. I Don't Know Why (I Just Do) (Remastered), from the album The Signature Collection, was released in the year 2012. The duration of the song is 2:54. Download English songs online from JioSaavn.