Create a musical piece with the provided alphabetic notation system and theme.
X:1
L:1/8
M:2/4
K:G
['GB Ac B/c/d Gd cd ef']  
X:1
L:1/8
M:2/4
K:G
 GB AG | AB Gd | cB c_e | dc BA | GB AG | AB GD | EG cE | FA dA | GB Ac | B/c/d Gd | cd ef | 
 ge dB | GB Ac | B/c/d Gd | cd ef | gd fa | g2 fe | dc Bg- | gg fe | d_e d2 | g2 fe | dc Be/f/ | 
 ga gf | d_e d2 | BG cd | GB AB/c/ | dG cB | A2 AG | B2 cd | GB AB/c/ | dG B/A/G/F/ | G2 G2 |]  