Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:A
['A/A/A cA EAce a2 ga faec', 'caAa c/B/A'  
X:1
L:1/8
M:4/4
K:A
 E2 | A/A/A cA EAce | a2 ga faec | d/d/d Bd c/c/c Ac | BFBA GEFG | A/A/A cA EAce | a2 ga faec | 
 defd ceaf | ecdB Aefg ||{g} a2 ea caAa | c/B/A ce{g} aAce |{a} b2 fb dbBb | d/c/B df bBdb | 
{g} a2 ea caAa | c/B/A ce aecA | defd ceaf | ecdB AEFG |]  