Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/2=104
M:4/4
K:G
['G2 BG', 'D e dgdB AGAB dgBg TAG E2']  
X:1
L:1/8
Q:1/2=104
M:4/4
K:G
 D | G2 BG AGBG | DGBG AGEA | G2 BG cBAB | GAGE D/D/D D || e | dgdB AGAB | dgBg TAG E2 | 
 de/f/ gB AGAB | GAGE D/D/D D |]  