Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:2/2
K:G
['GFGA B2 (Bc) ded^c', 'z gfga g2 (ga) bgag'  
X:1
L:1/8
M:2/2
K:G
 GFGA B2 (Bc) | ded^c (dg) g2 | =FEFG A2 (Bc) | dedc (BG)G z | GFGA B2 (Bc) | ded^c (dg)ga | 
 (bg)af (gd)de | (=fd)cA (BG)G z || gfga g2 (ga) | bgag fdde | =fefg f2 (ce) | dcBA (BG)G z | 
 gfga g2 (ga) | bgag (fd)dg | (bg)af (gd)de | (=fd)cA (BG)G z |]  