The Nashville High School Music Department is preparing for the Illinois High School Association Music Competition this weekend.  The concert band, jazz band, choir and jazz choir will be performing a pre-contest concert tonight at the high school at 7:30.  This weekend many bands and choirs from around southern Illinois will be performing Friday evening and all day Saturday at NCHS.  Tonight and this weekend are all free to the public.  The NCHS choirs will perform at 4:30 and 5:10 on Friday, while the bands will perform at 9 and 10 on Saturday morning.