Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:2/4
K:G
['D/B/A/B/ cB B2', 'G>c B/c/d/B/', 'gdBG [G,EB]>g fe/f/ a/g/f/e/ d2 |{B} [G,GB]>g'  
X:1
L:1/8
M:2/4
K:G
 BA/B/ cB | AG FE | D/B/A/B/ cB | B2 B2 |{c} BA/B/ cB | AGFE | D/B/A/B/ cB | B2 A2 :: 
{c} B/c/d/B/ G>c | B/c/d/B/ G>c | B/c/d/B/ GB | !>!B2 !>!A2 |{c} B/c/d/B/ G>c | B/c/d/B/ Gg | 
 ecAF | G2 z2 :: g2 fe/f/ | gdBG | [G,EB]>g fe/f/ | a/g/f/e/ d2 |{B} [G,GB]>g fe/f/ | gdBG | 
{c} e>c AF | GB G z :|  