Construct a musical piece that contains the provided motif and abides by the prescribed alphabetical scheme.
X:1
L:1/4
Q:1/8=150
M:2/2
K:G
['B3/2 A/ G E D E G2', 'A A/G/ F A G']  
X:1
L:1/4
Q:1/8=150
M:2/2
K:G
"A" B3/2 A/ G E | D E G2 | F G A2 | G A B2 | B3/2 A/ G E | D E G2 | F G A F | G2 G2 :| 
"B" A A/G/ F A | G A B2 | A A/G/ F A | G E D2 | A A/G/ F A | G A B2 | A A/G/ F A | G F G2 :|  