Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/4
Q:1/4=80
M:3/4
K:C
['[ec] g d G c/d/e/g/ B G', 'c2 g a/g/f/e/ d c/B/c/d/ d [ec]']  
X:1
L:1/4
Q:1/4=80
M:3/4
K:C
"_as written" [ec] g d | G c/d/e/g/ | B G c | f g g | g/f/e/d/c/B/ | c d"^+" d | c c2 || 
 g a/g/f/e/ | d c/B/c/d/ |"^+" d [ec] [ec] |]  