Develop musical creations that incorporate the designated chord alterations.
'D', 'G', 'A7', 'D', 'A7', 'D', 'D', 'G', 'A7', 'Em', 'G', 'A7', 'D'  
X:1
L:1/8
M:2/2
K:D
|:"D" dAFA dAFA |"G" decd"A7" e2 e2 |"D" defg{g} f2 ed |"A7" cdec"D" d2 d2 ::"D" A2 AF A2 AF | 
"G" BAGF"A7" G2 E2 |"Em" G2 GE"G" G2 GB |"A7" AGFE"D" D2 D2 :|  