Develop musical compositions in line with the specified format and incorporating the provided musical theme.
X:1
L:1/8
M:4/4
K:Bb
['f2 (d/c/d/f/)', 'B4 c2 (f/e/d/c/) d3 a (ba)(gf) T=e2', 'B4 Bdf g2 b fdB ecA Bdf', 'B3 cfe dba gaf =edc faf dba'  
X:1
L:1/8
M:4/4
K:Bb
|:"_Slow" f2 (d/c/d/f/) g3 b | fdTcB G2 F2 | f2 (d/c/d/f/) g>abg | fd{f} ed/c/ B4 :: 
 c2 (f/e/d/c/) d3 a | (ba)(gf) T=e2 (dc) | f2 (a/f/c) d2 (d'/c'/b) | af{a} gf/=e/ f4 | 
 _a2 Tg>f g3 =a | (bg)(fd) Td2 c2 | B2 (B/d/f/_a/) g>=abg | fd{f} ed/c/ B4 :: 
[M:6/8]"_Brisk" Bdf g2 b | fdB ecA | Bdf bag | fdf B3 :: cfe dba | gaf =edc | faf dba | gf=e f3 | 
 _agf g2 b | fdB c2 d | Bba gbg | fdB B3 :|  