Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/2
K:Bb
['bf d2 B2 B2', 'GE E2']  
X:1
L:1/8
M:2/2
K:Bb
 bf |"Bb" d2 B2 B2 dB |"F" cA F2 F2 BA |"Eb" GFED"F7" EGFE |"Bb" D2 B,2 B,2 || bf | 
"Bb" d2 B2 B2 bf |"C7" g2 =e2 c2 BA | Bcd=e fage |"F" f2 F2 F2 :: fe |"Bb" dB B2 dB B2 | 
"Eb" GE E2 GE E2 |"Cm" cdeg"^(C7)" fdcB |"F" A2 F2 F2 || de |"Bb" fBAB"Eb" gBAB | 
"Bb" bBAB"Gm" fBAB |"Cm" Ggfe"F7" dcBA |"Bb" B2 d2 B2 :|  