Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/8
M:4/4
K:Gdor
['DGGA (3Bcd cB AFcF dFcF DGGA Bdfd', '(3gab ag'  
X:1
L:1/8
M:4/4
K:Gdor
 DGGA (3Bcd cB | AFcF dFcF | DGGA Bdfd | cAfA AG G2 :| Gggf (3gab ag | fcgc acgc | dggf (3gab ag | 
 fdcA AG G2 | Gggf (3gab ag | fcgc acgc | bgaf (3gab ag | fdcA AG G2 ||  