Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/4
Q:1/8=200
M:4/4
K:G
['B G', 'f a b/a/g/f/', 'd2 e c c/d/e/c/ d B B/c/d/B/']  
X:1
L:1/4
Q:1/8=200
M:4/4
K:G
 B G B/c/ d | e c A c | B G g G | B2 d2 | B G B/c/ d | e c A c | B G g G | B2 d2 || f a b/a/g/f/ | 
 e g g f/e/ | f a b/a/g/f/ | e2 d2 | f a b/a/g/f/ | e g g f/e/ | f a b/a/g/f/ | e2 d2 || 
 e c c/d/e/c/ | d B B/c/d/B/ | g G G A | B2 d2 | e c c/d/e/c/ | d B B/c/d/B/ | g G G A | B2 d2 ||  