Why can't I skip songs backwards in iPhone music app?

If I want to go back to the previous track in my music list, by simply hitting the back arrow while music is playing, music app will not skip the current song to play the one previous. It will restart the current song but will not skip it. IPhone 5s. Why?!

Hit it twice. It's like an old school CD player. Once rewinds the song to the beginning, twice goes back a song.

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