If you would like to take a better understanding of connecting the dots of the common relationships found in music. Reading through the following links can in witch help brake down the concepts of Music Theory. While the following explains the circle of fifths showing the relationships among the 12 tones of the chromatic scale, their corresponding key signatures, and the associated major and minor keys. This will in turn give you the information you would need to get a better understanding of the music we love.
http://www.circleoffifths.com/
http://youtu.be/ylk7F7a1AyI
http://www.youtube.com/watch?v=Ik4AajaEx-0&feature=related
http://brainphreak.net/atonal/circleof5ths.txthttp://trainer.thetamusic.com/en/content/music-training-games