Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:G
['G>AB Bg>d', 'g/a/ b2 g']  
X:1
L:1/8
M:6/8
K:G
 G>AB Bg>d | d2 B A2 B/A/ | G>AB gdB | A3 z2 B/A/ | G>AB Bg>d | .d.e.f g2 f/e/ | .d.g.B .d.c.A | 
 G3 z2 || g/a/ | b2 g ag.e | d2 B B2 g/a/ | b2 g age | d3 g2 g/a/ | .b.a.g .a.g.f | 
 .d.e.f (!fermata!g2 f/e/) | .d.g.B .d.c.A | G3 z2 ||  