Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/4
K:D
['f2 f>e dB Bd']  
X:1
L:1/8
M:2/4
K:D
|:"D" f2 f>e |"G" dB Bd |"D" Ad d/c/d/e/ |"A7" fe ea |"D" f2 f>e |"G" dB Bd |"A" Aa af | 
"D" ed d>e ::"D" fd"G" ed |"D" fd"G" ed/e/ |"D" fa af |"E7" ed"A7" e>e |"D" fd"G" ed | 
"D" fd"G" ed/e/ |"D" fa"A7" af |1"D" ed d>e :|2"D" ed d ||  