Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:4/4
K:Bb
['B2 B,2 (3dcB (3AGF E2 g2 g2', '(3CB,A, B,DFB dfba g^fga g2']  
X:1
L:1/8
M:4/4
K:Bb
 (3cBA | B2 B,2 (3dcB (3AGF | E2 g2 g2 fe | dfBd ceAc | Bbag (3fgf (3edc | B2 B,2 (3dcB (3AGF | 
 E2 g2 g2 fe | dfBd ceAc | B2 d2 B2 :: (3CB,A, | B,DFB dfba | g^fga g2 (3BA_A | =A,CFA cfag | 
 f=efg f2 (3CB,A, | B,DFB dfba | g^fga g2 =fe | dfBd ceAc | B2 d2 B2 :|  