Listen to It Ain't Necessarily So online. It Ain't Necessarily So is an English language song and is sung by Miles Davis Orchestra and Gil Evans Orchestra. It Ain't Necessarily So, from the album 100 Miles Davis (Summertime, So What, 'round Midnight and All the Great Classics), was released in the year 2012. The duration of the song is 4:24. Download English songs online from JioSaavn.