Develop musical compositions by respecting the prescribed structure and combining the presented musical concept.
X:1
L:1/8
M:4/4
K:A
['aA A/A/A AcBA', 'a2 ae f2 fe'  
X:1
L:1/8
M:4/4
K:A
 aA A/A/A AcBA | GABc defg | aA A/A/A AcBA | dBGB A2 A2 :| a2 ae f2 fe | a2 ae f2 fe | agfe dcBA | 
 dBGB A2 A2 :|  