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:F
['z aaa ggg', 'FBd f2 (3(B/B/B/) Bdf', 'd2 F']  
X:1
L:1/8
M:6/8
K:F
 z | aaa ggg | .f.e.d .c2 z | BAB g2 z | c=Bc a2 z | aaa ggg | fed c2 z | BAB b2 g | f3- f2 |] 
[K:Bb] (3!fermata!F/F/F/ | FBd f2 (3(B/B/B/) | Bdf b3 (3(b/b/b/) | bag fdc | BdB F2 (3(F/F/F/) | 
 FBd f2 (3(B/B/B/) | Bdf b2 (3(b/b/b/) | bag fdc | Bdf"^D.C." b2 |] F | d2 F d2 F | ded cdc | 
 B2 A B2 d | c>BA/G/ FBc | d2 F d2 F | ded cdc | BAG BAG | d3-"^D.C." d2 |]  