Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/8=120
M:6/8
K:G
['G2 d BGB c2 A AFD BAG', 'ABc dBG ABc', 'dBG ABc']  
X:1
L:1/8
Q:1/8=120
M:6/8
K:G
|:"^A" G2 d BGB | c2 A AFD | BAG E2 E | AGF G3 :|"^B" Gee e>de | ABc dBG | ABc dBG | ABc d3 | 
 G2 d BGB | c2 A AFD | BAG E2 E | DEF G3 ||"^C" Gee e>de | ABc dBG | ABc dBG | ABc d3 | G2 d BGB | 
 c2 A AFD | (2:3:2BA G3 | (2:3:2EF G3 | (2:3:2DE F3 | G6 ||  