Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:G
['b2 ba ge d2']  
X:1
L:1/8
M:4/4
K:G
 eged G2 Bd | deed ef g z | gedB GBdg | b2 ba ge d2 | eged G2 Bd | e2 ed efga | gedB BABd | 
 b2 ba ge d2 | b3 g a3 a | agab aged | b2 bg a2 ba | gedB BAAG | b2 bg a3 a | agab aged | 
 BA A2 a2 b z | a2 ba aged |]  