Develop a musical composition incorporating the given motif and maintaining the required musical form.
X:1
L:1/8
M:6/8
K:D
['|{f} e3 z2', "a>b=c' b3 z2 d' |{b} a>gf e>de/f/"  
X:1
L:1/8
M:6/8
K:D
"_Plaintive" A | d>ed f<af |{f} e3 z2 a | Tf>ed B>AB | d3 z2 A | d>ed (f<a)f |{f} e3 z2 d' | 
 Tc'>ba Tf>ef | a3 z2 :: a | a>gf a>b=c' | b3 z2 d' |{b} a>gf e>de/f/ | A3 z2 A | Bde fd'b | 
{b} a3 z2 g | Tf>ed TB>AB | d3 z2 :|  