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
['[B,E]2 c', '(g<b).e (f<a).f'  
X:1
L:1/8
M:4/4
K:C
[M:6/8][K:Emin] .abc B, | [B,E]2 c BGE | D2 d AFD | [B,E]2 c BAF | GFE e2 (e/f/ | g)fe dcB | 
 (A/B/A).G FED | EFG ABc | BGF E2 :: B | eBe (g<b).f | dAd (f<a).f | eBe (g<b).e | 
 (f<a).f (g<b).e | (f<a).f gfe | (d{ed}cd) AFD | EFG ABc | BGF E2 :|  