Midnight Symphony is a 1944 jazz standard by Lester Young. A slow blues,[1] it was originally recorded in the key of B-flat major and is noted for its classic blues piano phrasing by Marlowe Morris, mellow tenor sax soloing by Young, and trumpet soloing by Harry Edison.[2] "Midnight Symphony", along with "On the Sunny Side of the Street", was included in the film of that year, Jammin' the Blues, which features Young performing the songs in a May 1944 jam with Red Callender, Harry Edison, Marlowe Morris, Sid Catlett, Barney Kessel and numerous others.[3] Many of them performed it together in clubs that year, including the Palm Club of Los Angeles.[4]