Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:4/4
K:G
['Bcd ecc efg dcB{f} gdB', 'dcB gdB', 'bag |{a} fed', 'gdB cAF .G2']  
X:1
L:1/8
M:4/4
K:G
{c} BG{F}G Bcd | ecc efg | dcB{f} gdB | A{c}BG ABc | .B2 G Bcd | ecc efg | dcB{f} gdB |{c} BAF G3 | 
 .B2 G Bcd | ecc efg | dcB{f} gdB | A3 ABc | .B2 G Bcd | ecc efg | dcB{f} gdB |{c} BAF .G3 || 
 g3{c'} bag |{fa} fed ^cde | dcB{f} gdB | A{c}BG AB/c/d | .g2 g{c'} bag |{fa} fed ^cde | 
 dcB{f} gdB |{c} BAF .G3 | g3{c'} bag |{fa} fed ^cde | dcB gdB | ABG ABc | .B2 G Bcd | ecc efg | 
 dcB{f} gdB |{c} BAF .G3 || BGG Bcd |{a} edc efg | dcB gdB | ABG ABc |{c} BAG Bcd | .e2 c efg | 
 dcB gdB | cAF G3 | .B2 G B3 |{a} edc efg | .d2 b gdB | a3 ABc |{c} BGd Bcd | edc e3 | .d2 b gdB | 
 cAF .G3 || g3{c'} bag |{a} fed B/^c/de | dcB GDB | A{c}BG AB/c/d | .g2 g{c'} bag |{a} fed ^cde | 
 dcb gdB | cAF .G2 d | g3{c'} bag |{a} fed B/^c/de | d2 b gdB | A3 ABc |{c} BGd B3 | ed^c efg | 
 dcB gdB | cAF .G2 d ||  