Listen to Mac Pherson Is Rehearsin' to Swing online. Mac Pherson Is Rehearsin' to Swing is an English language song and is sung by Chick Webb and Ella Fitzgerald. Mac Pherson Is Rehearsin' to Swing, from the album 55 Masterpieces, was released in the year 2011. The duration of the song is 3:06. Download English songs online from JioSaavn.