Construct a musical work using the letter-based representation of the specified pattern and the given melodic subject.
X:1
L:1/8
M:2/4
K:A
['=c2 d2']  
X:1
L:1/8
M:2/4
K:A
 AA=cd | =fe d2 | ed=cd | AA =G2 | =c2 d2 | AA=GB | =c2 d2 | A4 |]  