Develop musical pieces adhering to the provided chord changes.
'D', 'G', 'D', 'A7', 'D', 'D', 'D', 'B7', 'Em', 'A7', 'D', 'D', 'B7', 'Em', 'Em', 'D', 'A7', 'D'  
X:1
L:1/4
M:3/4
K:D
|:"D" [AF]2 [dA] | [fd]2 [ec] |"G" [dB]2 [cA] | [dB] [cA] [BG] |"D" [AF]2 [AF] | [FD]2 [GE] | 
 [AF]2 .[af] | [fd]3 |"A7" [GE]2 [GE] | [EC]2 [FD] | [GE]2 .[ge] | [ec]3 |1"D" [AF]2 [AF] | 
 [FD]2 [GE] | [AF]2 .[af] | [fd]3 :|2"D" [AF]2 [AF] | [fA]2 [eG] | [dF]3- | [dF]3 |] 
"D" [fA] [fA]/[eG]/ [dF] | [fA] [fA]/[eG]/ [dF] |"B7" [fA] [gB]3/2 [fA]/ |"Em" [eG]3 | 
"A7" [eG] [eG]/[dF]/ [cE] | [eG] [eG]/[dF]/ [cE] | [eG] [fA]3/2 [eG]/ |"D" [dF]3 || 
"D" [fA] [fA]/[eG]/ [dF] | [fA] [fA]/[eG]/ [dF] |"B7" [fA] [gB]3/2 [fA]/ |"Em" [eG]2 [fA] | 
"Em" [gB] [fA] [eG] |"D" [dF] [cF] [BG] |"A7" [AA] [B_A] [cG] |"D" [dF]3 |]  