Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:D
['f2 gfed']  
X:1
L:1/8
M:4/4
K:D
 A |"D" d2 (fd)"G" B2 ed |"A7" cABc"D" dAFD |"D" d2 (fd)"G" B2 (ed) |"A7" cABc"D" d2 d :| e | 
"D" f2 (df)"G" gfed |"A7" cABc"D" dAFD |"D" f2 (df)"Em" gfed |"A7" cABc"D" d2 (de) | 
"D" f2 (df)"G" gfed |"A7" cABc"D" dAFD |"D" dfdf"A7" cecA |"G" Bg"A7"ec"D" d2 |]  