Produce pleasing melodies that correspond with the indicated letter notation and incorporate the suggested theme.
X:1
L:1/8
Q:1/8=220
M:4/4
K:Bb
['F2 B2 B2 cd e2 d2 c2', 'e2 e2']  
X:1
L:1/8
Q:1/8=220
M:4/4
K:Bb
"^Cheerful" F2 B2 B2 cd | e2 d2 c2 B2 | BdcB c2 F z | F2 B2 B2 cd | e2 d2 c2 B2 | fgfg f2 F z |] 
 f2 f>f f2 ed | e2 e2 e2 dc | (d3 e) (d2 cB) | c4 z4 | F2 B2 B2 cd | e2 d2 c2 B2 | F2 B>c B4 | 
 A>Bc>d c4 | B2 f>g f3 e | (d3 c) B4 ||  