Develop musical pieces that conform to the specified format and include the suggested musical theme.
X:1
L:1/8
Q:1/2=90
M:2/4
K:D
['ecAc e2 (dc)', 'e2 (dc)'  
X:1
L:1/8
Q:1/2=90
M:2/4
K:D
 f | ecAc | e2 (dc) | dBBc | dBBf | ecAc | e2 (dc) | BAAc | B>AA :: g | fefg | e2 (dc) | dBBc | 
 dBBg | fefa | e2 (dc) | BAAc | B>AA :|  