Listen to Summer Time / It Ain't Necessarily So online. Summer Time / It Ain't Necessarily So is an English language song and is sung by Jane Froman. Summer Time / It Ain't Necessarily So, from the album Greatest Classics: Sara Vaughan, Ella Fitzgerald, Jane Froman, was released in the year 2014. The duration of the song is 4:05. Download English songs online from JioSaavn.