Jazz is one of the great song , it is usually played by a saxophone and piano. The chords are diminished 7 or etc.. Jazz is one of relaxing song , there are swing jazz , blue jazz , cool jazz , swing ballad and etc. If you want to relax yourself , you should try to listen the jazz music. Jazz music have so much variations in its music, bluesy tunes , jazz rythms , cool harmonies , of course all of this characteristics make jazz different from other musics.