Develop a song that integrates the given musical theme as a fundamental aspect.
'Sectional: Through Composed'  
X:1
L:1/8
M:6/8
K:Bb
 F |: TB3{AB} TB3 |{AB} TBAB def | TB3{AB} TB3 |{AB} GcB{B} AGF | TB3{AB} TB3 |{AB} B3{AB} def | 
 gab{g} fed | cdB cAF :: (de)f fgf | (f>g)f fed | (ef)g gag | (ga)g gfe | (de)f fgf | (fg)f fga | 
 bag fed | cdB cAF :| dBB fBB | gBB fBB | dBB fBB | cdB cAF | dBB fBB | gBB fga | bag fed | 
 cdB cAF | dBB fBB | gBB fBB | dBB fBB | cdB cAF | dBB bBB | aBB gBa | bag fed | cdB cAF ||  