Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:3/4
K:Bb
['B2 Fd']  
X:1
L:1/8
M:3/4
K:Bb
 Fd | Fe/e/ A2 Ge | Fd/d/ B2 Fd | eF A2 Fe | dF B2 Fd | Fe A2 gf | fd B2 Fd | FeAFeA | B2 z2 |]  