Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/16
M:2/4
K:D
['BAFA defd', 'd2f2d2 de fdec d2Bc dBc^A B2gf efed'  
X:1
L:1/16
M:2/4
K:D
 A,2 | D2FA BAFA | defd edBd | BAFD EDB,D | FB2c BAGE | DF2A BAFA | defd efg^g | afdA Bdce | 
 d2f2d2 :: de | fdec d2Bc | dBc^A B2gf | efed cdcB | ^A2c2 f2de | fdec d2ef | gfga b2ag | 
 fdAF GAce | d2f2d2 :|  