Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/4
K:G
['G/A/B/c/ dc BA Gd G/A/B/c/ dg fg', 'Bd Bd', 'G>A B>c d2']  
X:1
L:1/8
Q:1/4=120
M:2/4
K:G
"^A" G/A/B/c/ dc | BA Gd | G/A/B/c/ dg | fg ad | g/f/g/a/ bg | af gd | gd c/e/d/c/ | BA G2 || 
"^B" Bd Bd | Bd dc/B/ | ce ce | ce ee/f/ | g/f/g/a/ bg | af gd | gd c/e/d/c/ | BA G2 || 
"^C" G>A B>c | d2 c2 | B2 A2 | G2 D2 | G>A B>c | d2 g2 | f2 g2 | a2 d2 | g/f/g/a/ bg | af gd | 
 gd c/e/d/c/ | BA G2 ||  