Create music compositions that adhere to the given structure and incorporate the provided musical concept.
X:1
L:1/8
M:4/4
K:Bb
['B2 bg', '(BGFE) DEFD'  
X:1
L:1/8
M:4/4
K:Bb
 F | B2 bg fdcB | AFcF dFcF | B2 bg (fdcB) | FBAc dBB :: c | (BGFE) DEFD | ECC=B cGGA | 
 (BGFE) DEFD | B,BAc dBB :|  