Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:3/4
K:G
['', 'd3 e', 'BA Dc']  
X:1
L:1/8
M:3/4
K:G
 G GB |: e2 eg eB | e3 e ee | d2 de dc | B3 A AB | cB AB ce |1 d3 e ed | dc cB BA | B2 B2 GB :|2 
 d3 e dc | Bc BA GF | E6 :| Ec cB BA | Dc cB BA | Dc cA FA | GB Bc cd | Ec cB BA | Dc cB BA | 
 Dc cA FA |1 :|2 G6 ||  