Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:D
['dA A/A/A', 'fd efge'  
X:1
L:1/8
M:4/4
K:D
|: dA A/A/A AFAB | dA A/A/A f2 ef | dB B/B/B BABd | ABde faef :: d2 fd efge | defd e2 dB | 
 A2 fd efge |1 aA A/A/A f2 ef :|2 abag faef ||  