Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/4
Q:1/4=120
M:3/4
K:Gmix
['G c e c/B/ c G G/G/', 'c d', 'd e', 'E2 G/G/ c d c/B/ c G']  
X:1
L:1/4
Q:1/4=120
M:3/4
K:Gmix
 G | c e c/B/ | c G G/G/ | A c A | G2 || G | c d c/B/ | c d c/d/ | e c A | G2 || c | d e B/c/ | 
 d e c/d/ | e c A | E2 || G/G/ | c d c/B/ | c G G/G/ | B c A | G2 |]  