Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
Q:1/4=100
M:6/8
K:G
['G2 A']  
X:1
L:1/8
Q:1/4=100
M:6/8
K:G
 B | E2 E G2 A | B2 c (B3 B) | E2 E G2 A | B2 c d2 c | B2 A G2 A | B2 G E2 D | (E3 E3) | F3 z2 F | 
 B2 ^c d2 c | B2 ^A B2 =A | d2 e f2 e | d2 ^c d2 =c | B2 d =c2 B | A2 G (F3 F) | E2 E G2 A | 
 B3 d3 | B2 A G2 F | (E3 E2) |]  