Develop musical compositions in line with the specified format and incorporating the provided musical theme.
X:1
L:1/8
M:4/4
K:A
['', 'af ecBd cAAB'  
X:1
L:1/8
M:4/4
K:A
 af |: ecBd cAAB | c2 cB c2 af | ecBd cAAB | cffe f2 af :|  