Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:3/4
K:G
['Bc db gd BG F2', 'g2 z2']  
X:1
L:1/8
M:3/4
K:G
 Bc |:"G" db gd BG |"D7" F2 Ad ce | F2 Ad cf |"G" G2 Bd dg | db gd BG |"D7" F2 Ad ce | 
"D7" F2 Ad cf |1"G" g2 z2 Bc :|2"G" g2 z2 c'b |:"D7" ac fa ca |"G" gB dg Bg |"D7" fA cg fe | 
"G" dg bd' c'b |"D7" ac fa ca |"G" gB dg Bg |"D7" fA cd ba |1"G" g2 z2 c'b :|2"G" g2 z2 z2 |]  