Develop a musical composition based on the outlined framework and thematic material.
X:1
L:1/8
Q:3/8=100
M:6/8
K:Bb
['f b2 d g2 c f2 A', 'f2 f g2 E- EGB ega bag'  
X:1
L:1/8
Q:3/8=100
M:6/8
K:Bb
 f | b2 d g2 c | f2 A B2 (c/4d/4e/) | d>cB A2 B | c2 F F2 (f/4g/4a/) | bfd gec | 
 fdB A2 (g/4a/4b/) | a>gf Tg3 | f3 f2 |: f | g2 E- EGB | ega bag | f2 D- DFB | dfa bfe | dcB Tc3 | 
 B3 B2 :|  