Compose music pieces conforming to the prescribed pattern and incorporating the provided musical concept.
X:1
L:1/8
Q:1/8=120
M:4/4
K:D
['', 'AB (3cBA', 'a2 af gbag'  
X:1
L:1/8
Q:1/8=120
M:4/4
K:D
 fg |: a2 af gbag | fdfa gfec | dcde fdec | dedc AGFG | AB (3cBA dcAG | FDFG AB (3cBA | 
 dcdf edce |1 d2 dc defg :|2 d2 dc d2 A2 || dcde fefg | a2 af defg | a2 af gbag | fefe defg | 
 a2 af gbag | fdfa gfef | dcde fdec | dedc A2 fg | a2 af gbag | fdfa gfef | dcde fdec | dedc AGFG | 
 AB (3cBA dcAG | FDFG AB (3cBA | dcdf edce | d2 dc d2 z2 ||  