Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:1/4=90
M:3/4
K:G
['(.g.f.e) (d2 B)G (BA) (A2 B)d (ed)', 'G3 (G/A/) .B.c d2 (fe) (ed) (GB/d/)'  
X:1
L:1/8
Q:1/4=90
M:3/4
K:G
"_VB" (.g.f.e) | (d2 B)G (BA) | (A2 B)d (ed) | (B2 G)B AG | G3 (g/f/) fe | d2 BG BA | A2 (Bd) cd | 
 B2 GB A>G | G3 || (G/A/) .B.c | d2 (fe) (ed) | !fermata!d2 (GB/d/) ef | (g>f g)b ag | 
 Tg2 !fermata!f a/g/ fe | ^cd/=c/ BG BA | A3 B cd | B2 GB A>G | G3 |]  