Create music compositions that adhere to the given structure and incorporate the provided musical concept.
X:1
L:1/8
M:4/4
K:D
['e3 f gfgf ec A2 [ca]2 [ca]2'  
X:1
L:1/8
M:4/4
K:D
|: ag |"D" f z df"A" ecAc |"D" d2 A2 F2 dc |"G" BGBG"D" AFDF |"A" A,2 A,2"D" D2 ag | 
"D" f2 df"A" ecAc |"D" d2 A2 F2 dc |"G" BGBG"D" AFAg |"A" fdec"D" [fd]2 :: z2 |"A" e3 f gfgf | 
"A" ec A2 [ca]2 [ca]2 |"A" e2 ef"G" gfeg |"A" fdec"D" d2 d2 |"A" e3 f gfgf |"A" ec A2 [ca]2 [ca]2 | 
"A" c2 [ca][ca]"G" B2 [Bg][Bg] |"A" fdec"D" [fd]2 :|  