Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:C
['(GF) EGce g2 (GE) FAcf a2 (ba)', '(ba) gGce g2 (ag)'  
X:1
L:1/8
M:4/4
K:C
 (GF) | EGce g2 (GE) | FAcf a2 (ba) | gecB cege | f2 d2 d2 (GF) | EGce g2 (GE) | FAcf a2 (ba) | 
 gecB cdec | d2 [Ec]2 [Ec]2 :: (fg) | a2 Acfa (ba) | gGce g2 (ag) | fGBd bafd | cBcd e2 (fg) | 
 aAcf a2 (ba) | gGce g2 (ag) | ^fgba g=fed | e2 [Ec]2 [Ec]2 :|  