Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/2=90
M:4/4
K:F
['cB A2 F2 F2 GA', 'f2 fg afdf Afcf afdf bagf gece']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:F
"_Key sig. Bb in MS" cB | A2 F2 F2 GA | B2 G2 G2 cB | Acfe dcBA | G2 C2 C2 cB | A2 F2 F2 GA | 
 BABc defg | abga ecde | f2 a2 f2 :: fg | afdf Afcf | afdf bagf | gece Aece | gece gfef | 
 dfcf BfAf | GABc defg | abga ecde | f2 a2 f2 :|  