Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:1/4=140
M:4/4
K:D
['de fdec dBAG F2 D2 D2 A2', '', 'A2 dcdA dcdA e^deA edeA fefd fefa']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:D
 de | fdec dBAG | F2 D2 D2 A2 | BcdB gfed | c2 A2 A2 AG | FEFA BABd | cBcA d2 cB | AdBG FAGE | 
 D2 D2 D2 |] A2 || dcdA dcdA | e^deA edeA | fefd fefa | edcB A2 A2 | gfgb fefa | edea dcda | 
 gefd cBcA | d2 [dF]2 [dFD]2 |]  