Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/8
Q:1/4=104
M:4/4
K:G
['Bc d3 g edcB dBdg edcB cBAB', 'ag a>gab a2 ga b>age dgBc d3']  
X:1
L:1/8
Q:1/4=104
M:4/4
K:G
"^moderato" Bc | d3 g edcB | dBdg edcB | cBAB GABc | d3 c B2 d2 |"^5" e2 eg e2 de | gfga b2 ab | 
 gfed g2 B2 | A4 G2 || ga |"^9" b2 b2 b2 ag | a>gab a2 ga | b>age dgBc | d3 c B2 d2 | 
"^13" e2 eg e2 de | gfga b2 ab | gfed g2 B2 | A4 G2 |]  