Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/8=120
M:2/2
K:C
['G/A/B/ c2 ce d/c/B/A/ GA/B/ cGAB cGEC', 'g/f/ efg cde (d>e)c{cA} B2 A GA_B', 'A/B/ cBAG AD D2 d/e/f/e/ dc BA/G/']  
X:1
L:1/8
Q:1/8=120
M:2/2
K:C
 G/A/B/ | c2 ce d/c/B/A/ GA/B/ | cGAB cGEC | F/G/A/B/ A/c/B/A/ G/A/B/c/ B/d/c/B/ | 
 cB/A/ G/F/E/D/ C3 :|[M:6/8] g/f/ | efg cde | (d>e)c{cA} B2 A | GA_B GAB | AD^F G2 :|[M:2/2] z | 
 cGAB c3 A/B/ | cBAG AD D2 | d/e/f/e/ dc BA/G/ cd | ed/c/{de} d2{cd} c3 :|  