Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['E,2 CD E3 CEDDB, C4']  
X:1
L:1/8
M:4/4
K:C
 G,2 | C2 CC C2 E2 | C2 G,G, E,2 CD | E3 CEDDB, | C4 z2 CD | E2 EEFEDC | D2 B,2 G,2 G,B, | 
 DDDFEDCB, | C2 G,2 E,2 CD | E3 CEDDB, | C4 z2 |]  