Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
Q:1/4=100
M:2/4
K:C
['', 'c2 BA', 'E>DCE D2 B,2 C4 ::{G} CE Gc', 'c/B/A/B/ c/B/c/B/', 'B,D F2 ED']  
X:1
L:1/8
Q:1/4=100
M:2/4
K:C
 EG |: c3 B | c2 BA | G3 A | c2 BA | G4- | GA EF | G3 A | F2 ED | C3 D | F2 ED | C4- |1 C2 EG :|2 
 GGGG | G3 E | FF/E/ DC | FG FE | F3 G | ED C2 :: D>EFD | E>DCE | D2 B,2 | C4 ::{G} CE Gc | B2 GA | 
 B4 | AAAB | G4 |{G} CE Gc | A2 FD | B,3 D | F2 ED |1 C4 :|2{G} C3 E/G/ |: c/B/A/B/ c/B/c/B/ | 
 A/B/A/G/ FA | c/B/A/B/ c/B/c/B/ | G/A/G/E/ CE/F/ | GE/G/ A/F/E/F/ | D{ED}C B,D | F2 ED | 
 E>D CE/F/ | GE/F/ A/F/E/F/ | D{ED}C B,D | F2 ED |1 C3 E/G/ :|2 C4 ||  