Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:4/4
K:C
['G2 BG', 'edBd egfa', 'dcBd egfa', '(3efg af']  
X:1
L:1/8
M:4/4
K:C
[M:4/4][K:G] e Cef' e be(3.DEF | G2 BG dGBG | FADA FADA | G2 BG dGBd | egfa gedB |"^5" G2 BG dGBG | 
 FADA FADA | G2 BG dcBd | egfa g2 || (3def |"^9" gdBd edBd | gdBd e2 ef | gdBd edBd | egfa g3 d | 
"^13" gabg efge | dedc BGBd | edef edBd | egfa gedB ||"^17" G2 BG dcBG | (3FED AD BDAD | 
 G2 BG dcBd | egfa gedB |"^21" G2 BG dcBG | (3FED AD BDAD | G2 BG dcBd | egfa g2 || (3def | 
"^25" g2 gf gdBd | faag fdef | g2 gf gdBd | (3efg af g3 d |"^29" gabg efge | dedc BGBd | 
 edef edBd | (3efg af gedB ||  