Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:3/4
K:G
['d/e/f g2 d2 g>a |{g} f2 edef', 'G2 g2 g2 b/a/g', 'e/d/B d2 d2 Bd B/4d/4e3/2{e} dB A>G', 'TgedBA>G G6 ::{e} TdcBcde TdcBcdG Tgdgbag Tfefgfg']  
X:1
L:1/8
M:3/4
K:G
"^Slow" d/e/f | g2 d2 g>a |{g} f2 edef | g2 gbag |{g} f4 (ed) | e2 egfe | d4 e/4f/4g3/2 | 
{g} fedcBA | G4 :: G/A/B | d2 d2 e/d/B/d/ |{d} e2 d/B/G G2 | g2 g2 b/a/g |{g} f4 ed | 
{d} e2 e2 e/d/B |{B} d4 B>d |{d} e2 dB A>G | G4 :: G/A/B | d2 d2 e/d/B/c/ | B/d/e e/d/B/G/ G2 | 
 g2 g2 b/a/g | f2 f2 ed | e2 e2 e/d/B | d2 d2 Bd | B/4d/4e3/2{e} dB A>G | G6 :|"^Quick" g>dgba>g | 
{g} Tfedefd | Tgdgbag | Tfefgfg | Tedefge | TdBABde | TgedBA>G | G6 ::{e} TdcBcde | TdcBcdG | 
 Tgdgbag | Tfefgfg | Tedefgf | TdBABde | TgedBA>G | G6 :|  