what software can use to place background music in my games??, current use Melody Raiser (midi is a generator but it is not always according to the game).
Don't understand the question, you mean making music?
which program you use to create the melodies or music you put on the games?
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Pretty big topic, can you write music? Maybe look at Reason - that contains most the sounds, instruments and recording features someone starting out would need.
If you can't write music, here are some generators for sound effects and music:
http://www.bfxr.net/
http://onlinesequencer.net/
http://www.seaquence.org/
http://getsoundly.com/
http://sfbgames.com/chiptone/
http://www.superflashbros.net/as3sfxr/
http://scribble.audio/