Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:2/4
K:Bb
['F BABB d/c/ABB cdef d2 cc c>dec']  
X:1
L:1/8
M:2/4
K:Bb
 F | BABB | d/c/ABB | cdef | d2 cc | c>dec | de f2 | Bd c2 | BAGF | Bcd>B | c2 B |]  