Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:2/2
K:B
['B,C DCB,D', "b2 ^ab c'g g2 gf=f^f b4"  
X:1
L:1/8
M:2/2
K:B
 B,C |:"Bm" DCB,D F2 DF | B2 FB FABc | dcBd f2 df | bffb fabc' | d'c'ba gfed |"Em" ceec e4 | 
"F#7" f=f^fg fedc |"Bm" BB,B,B, B,2 z2 ::"Em" b2 ^ab c'g g2 |"Bm" gf=f^f b4 |"F#7" f2 =f^f g2 fe | 
"Bm" dedc dc B2 |"Em" b2 ^ab c'g g2 |"Bm" gf=f^f b4 |"F#7" f=f^fg fedc |1"Bm" BB,B,B, B,2 z2 :|2 
"Bm" B2 z2"A7" A2 Bc |:"D" d2 Ad FAdf | d2 Ad FAdf |"A7" e2 ce Acec |1"D" d2 c'b"^(G7)" agfe :|2 
"D" df"A7"ec"D" d2 z2 :|  