Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:G
['D3 AFD G2 G']  
X:1
L:1/8
M:6/8
K:G
 D |"G" G3"D" FED |"C" E2 F"C/E" G2 A |"G" B2 G"C/G" c2 A |"G" B2 G"D/F#" cBA |"G" Bcd"C" E3 | 
"D" FGA"D/F#" D3 |"C" GFE"D" AFD |"Gsus4" G3"G" G2 :| G |"G" ded"D/F#" def |"Em" g3"Em/D" g3 | 
"C" cdB"C/B" cdc |"Am" e3"C" e3 |"G" dcB"Am" c2 A |"G/B" Bcd"G" D3 |"C" EFG"D/F#" AFD | 
"Gsus4" G3"G" G2 :| G |"Em" BGE EGE |"D" AFD DFD |"C" EGE"D" F/G/AG |"D" F3"D/F#" D3 | 
"G" Bcd"G/B" dBG |"C" cde"Am7" ecA |"C" GFE"D" AFD |"Gsus4" G3"G" G2 :|  