Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['', '(3(EFG) cA', 'a gede (TcBc)f (Tge)df eaaf (Tge)de (TcBc)A']  
X:1
L:1/8
M:4/4
K:C
 .abc ||[M:2/2][K:C] (3:2:1TG | (3(EFG) cA (TGFG)G | EGcG EDDG | (3(EFG) cA (TGFG).A | cded cAAG | 
 (3(EFG) cA G3 G | EGcG EDDG | (3(EFG) cA G3 a | gedf ecc || a | gede (TcBc)f | (Tge)df eaaf | 
 (Tge)de (TcBc)A | GcGF ECCf | (Tge)de TcBcf | gedf eaaf | geaf gedc | (3(ABc) GF Ec c2 |]  