Research

Does listening to music make you productive?
Does listening to music help you concentrate while studying or working?
Does listening to music affects the our brain in a good way or bad way?

Positive :
http://www.phoenix.edu/forward/student-life/2011/08/should-you-listen-to-music-while-studying.html
http://www.teachersatrisk.com/2006/09/23/listening-to-music-helps-students-be-more-productive-in-the-classroom/

Negative :
http://www.ehow.com/info_8767350_bad-effects-listening-music-studying.html

Both :
http://www.ehow.com/about_5316884_positive-negative-effects-music.html (more links to other questions such as effects of diff. kinds of music on different ages etc.)
http://www.scottseverance.us/music/effects_of_music.htm
http://voices.yahoo.com/music-health-benefits-harmful-effects-2189003.html
http://www.mdblogger.com/2012/05/positive-and-negative-effects-of-music.html (partially health-aspects)