Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:6/8
K:G
['c B']  
X:1
L:1/8
M:6/8
K:G
 G | G B d c B A | G B d2 c B/ d/ | e c e d B d | c A c2 B c/ B/ | A d f B ^c d | A F D D2 A | 
 A B c B c d | E F G F2 G | A F G c B A | G B d c2 (B/d/) | e f g A B c | B G G G3 | 
"^chorus" d2 d d2 c/B/ | e2 e e2 g | d3/2 e/ d B2 A | G3/2 A/ B D3 | E G A B g e | d B A G2 z |]  