Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
M:4/4
K:G
['z ba']  
X:1
L:1/8
M:4/4
K:G
 eged G2 Bd | e z ed egga | gedB BA A2 | b z ba ge d z | eged G3 d | e z ed egga | gedB BA A2 | 
 b z ba ge d2- | d z bg a z ba | gedB dega | bg g2 a z ba | gedB BA A2 | b z bg a3 z | agab aged | 
 BAAG a z ba | ag b z aged |]  