Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:C
['eA (3AAA (3(efg)', 'Tg3 a']  
X:1
L:1/8
M:4/4
K:C
 |[M:2/2][K:Ador] (3:2:2Tgf | eA (3AAA (3(efg) d(c | BA)G(A Bc)df | eA (3AAA (3(efg) dc | 
 BAGB A2 (gf) | eA (3AAA (3(efg) d(c | BA)GA Bc d2 | eaa(g (3efg) d(c | BAG)B A2 || (dc) | 
 BGBd Tg3 a | bgaf g(e d2) | e(aag) a2 (ga) | bga(f ge)dc | B(GBd) Tg3 a | bga(f gf)ed | 
 eaa(g (3efg) d(c | BA)GB A2 |]  