Peace, if your music are in those terms Eb etc, basically you would want to scale down to a different feel. Ok let me make it easy. Your bridge part need to be smooth, and totally different from your original composition. it's like making a new beat within a beat. You get your bridge from feeding off of your main composition, and you scale down. I am a learned ear player, I know what Eb and all that means but to put it in writing to you I can't do it. Look below you music should end up to the bridge for example.
"La la la la la la la la do do do do La la la la"
La represent the orginal composition and do represent your bridge. I see a lot of producers straying away from bridges and just make the artist sing a different tune, which is lazy, you can tell who knows music and who doesn't . with me I like to make a nice intro, verse, b-section chorus, verse 2 , b-section , chorus, bridge, chorus then end.