Create musical pieces following the given structure and incorporating the suggested musical concept.
X:1
L:1/4
M:2/4
K:A
['[dB] [BG]', '[cA]/ [BG] [ec]/[dB]/ [cA] [dB] [ec] [cA]'  
X:1
L:1/4
M:2/4
K:A
|:"A" [AE] [cA] | [ec] [cA] | [ec]/[ec]/ [ec]/[cA]/ |"E7" [dB] [BG] | [BG] [cA] | [dB] [BG] | 
 [ec]/[ec]/ [ec]/[dB]/ |"A" [cA] [AE] ::"D" [fd]3/2 [ec]/ | [dB]/[ec]/ [fd] |"A" [ec]3/2 [dB]/ | 
 [cA]/[dB]/ [ec] |"E7" [dB]3/2 [cA]/ | [BG] [ec]/[dB]/ |1"A" [cA] [dB] | [ec] [cA] :|2 
"A" [cA]"E7" [BG] |"A" [AE] z :|  