Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:F
['GG GA']  
X:1
L:1/8
M:4/4
K:F
 G | GG GA EC CC | GG GA B3 G | FF FG DB, B,B, | DD DE F3 | B | cc cc cC CC | GF GA B2 cB | 
 GG GG GG GA | EC CC C3 ||  