Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:3/4
K:C
['GE C2 C2 CE D2', 'F2 E4 GE C2 CE CE D2']  
X:1
L:1/8
M:3/4
K:C
 GE |:"C" C2 C2 CE |"G7" D2 D2 DE | F2 FG F2 |"C" E4 GE | C2 CE CE |"G7" D2 DF DF | B,2 B,D DB, |1 
"C" C4 GE :|2"C" C4 G2 |:"C" G2 F2 E2 |"G7" D4 A2 | A2 G2 F2 |"C" E4 GE | C2 CE CE |"G7" D2 DF DF | 
 B,2 B,C DB, |1"C" C4 G2 :|2"C" C4 z2 |]  