Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/2
K:Dmix
['c3 B c2 AB', 'c2 gc', 'eg g2', 'dcAG FGAB', 'c2 gc acgc', 'ea^ga ed d2', 'defg afge f2 fe |1 dcAG FAdf']  
X:1
L:1/8
M:2/2
K:Dmix
|:"^Version 1:" c3 B c2 AB | cBAG EG G2 | Add^c defe | dcAG FGAB | c3 B c2 AB | cAAG EFGE | 
 DEFG ABcA |1 dcAG FGAB :|2 dcAG FD D2 |: eg g2 ag g2 | eg g2 edBd | ea a2 bgag | eaag edBd | 
 eg g2 ag g2 | egge defg | afge fde^c |1 dcAG FD D2 :|2 dcAG FGAB |: c2 gc acgc | c2 gc ecAc | 
 d2 ad bdad | d2 ad ed (3Bcd | c2 gc acgc | efge defg | afge fde^c |1 dcAG FGAB :|2 dcAG FD D2 |: 
 eg g2 ec c2 | eg g2 ed (3Bcd | eaag ed d2 | edad ed (3Bcd | eg g2 ec c2 | efge defg | 
 afge fde^c |1 dcAG FD D2 :|2 dcAG FGAB |:"^Version 2:" c3 B cBAB | cBcG EG G2 | Add^c de=fe | 
 dcAG FGAB | c2 cB cBAB | cAG=F EDCE | DE=FG ABcA |1 dcAG FGAB :|2 dcAG FAdf |: g2 fa g2 fa | 
 eg g2 ec c2 | eaag abag | e2 ag ed d2 | egge afge | fage defg | afge f2 fe |1 dcAG FAdf :|2 
 dcAG FAdB |: c2 gc acgc | c2 gc acgc | d2 ad bdad | d2 ad bdad | c2 gc acgc | fage defg | 
 afge f2 fe |1 dcAG FAdB :|2 dcAG FAdf |: g2 fg ec c2 | egfg ec c2 | ea^ga ed d2 | ea^ga ed d2 | 
 egge afge | fage defg | afge f2 fe |1 dcAG FAdf :|2 dcAG FGAB ||  