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=56
M:2/4
K:C
['G/GG/ GF/E/']  
X:1
L:1/8
Q:1/4=56
M:2/4
K:C
 G3 F | F<E-EE/F/ | G/GG/ GF/E/ | G/GG/ GF/E/ | G<F- F2 | A3 G | G<F-FF/G/ | A/AA/ AG/F/ | 
 A/AA/ AG/F/ | A<G- G2 | G3 F | F<E-EE/F/ | G/GG/ GF/E/ | G/GG/(3_BBB | A3 F/G/ | A/AA/ (3ABA | 
 A/GG/ (3GAG | G/FG/ A/G^F/ | G3 F/G/ | A/AA/ (3ABA | A/GG/ (3GAG | G/FG/ A/GF/ | E4 |]  