Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/4
M:2/2
K:G
['F F E4- E2']  
X:1
L:1/4
M:2/2
K:G
 D D | G3/2 G/ G G | G3/2 G/ F A | G2 F E | D3 D | B3/2 B/ B B | B3/2 B/ A c | B4- | B2 G B | 
 d3/2 d/ d d | d2 A B | c/ B3/2 A A | F2 F F | E4- | E2 F F | E4- | E2 E E | D4- | D3 |]  