Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/16
M:2/4
K:Bb
['fedc BABc dBFD', 'dfba gEGB egbg f=efg']  
X:1
L:1/16
M:2/4
K:Bb
 (vf"^3"ga |"^fz" b2)vaug fedc | BABc dBFD | FBAB GBAB | dBed cfga |"^fz" vb2vag fedc | BABc dBFD | 
 EGcd ecag | fedc B2 :: (ufe) | dDFB dfba | gEGB egbg | f=efg fdBd | edc=B cf=e_e | dDFB dfba | 
 gEGB egbg | f=efg f_edc | Bbfd B2 :|  