Construct harmonious tunes in line with the outlined letter symbolism and the presented thematic component.
X:1
L:1/8
M:2/2
K:Bb
['gfed c2']  
X:1
L:1/8
M:2/2
K:Bb
|: (BA)GF (FB)BB | (Ac)cc (Bd)dd | (ce)ee (df)ba |1 gfed c2 d2 :|2 gfed c2 B2 |]: (df)ff (gf)ff | 
 (eg)gg (ag)gg | (df)ff (gf)ff |1 edcB Acfe :|2 gfed c2 B2 |]  