Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:A
["([A-c']3 [Ae]4) ([Aa]3 a/g/ [Af]3) (g/f/ [Ae]2)", 'A4 c4 d4 [df]3 ([A-f]'  
X:1
L:1/8
Q:1/4=120
M:2/2
K:A
"^Fast" ([A-c']3 [Ae]4) | ([Aa]3 a/g/ [Af]3) (g/f/ | [Ae]2) ef [Ae]2 [ce][Ae] | 
 [Be]2 [Be][ce] ([Be]/c/B) A2 | ([A-c']3 [Ae]4) | ([Aa]3 a/g/ [Af]3) (g/f/ | 
 [Ae]2) ef [Ae]2 [ce][Ae] | [Be][Ae]GB A2 [AA]2- | [AA]2 AA c2 ee | aegg bgeg | 
 agaf e[ce][ce][Ae] | [Be]3 c [Be]2 [AA]2- | [AA]2 AA c2 ee | aegg bgeg | agaf e[ce][ce][Ae] | 
 [Be][Ae][Ae][Be] [AA]4 |: A4 c4 | d4 [df]3 ([A-f] | [Ae]3) f [Ae]2 cA | [Be]2 [Be][ce] [Be]AFG | 
 A4 c4 | d4 [df]3 ([A-f] | [Ae]2) af [Ae]2 cA | BAGB A2 AA :|  