Nicolas King, Charles Calello, Tomey Sellars Photo

From: Photos: Nicolas King & Tomey Sellars Join Legendary Arranger Charles Calello's Big Band

The amalgamation of music you hear accompanying and supporting a melody line are most times just as important for the arousal of your musical senses as is the original tune itself.  The mood of the song is set by the arrangers ( really composers) who create those sounds.