Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:G
['BA |]:', 'GABG A2 GA Bdef gedB GABG', 'Bd edBd edgd edBd e3 f', 'GABG dBAG E2 BA GEDE GABG A2']  
X:1
L:1/8
M:4/4
K:G
 BA |]: GEDE GABG | A2 GA Bdef | gedB GABG | dBAG E2 BA | GEDE GABG | A2 GA Bdef | gedB GABG |1 
 AGEF G2 BA :|2 AGEF G2 Bd |] edBd edgd | edBd e3 f | gedB"^var." GABe | dBAG E2 Bd | edBd edgd | 
 edBd e3 f | gedB GABG | AGEF G2 Bd || edBd edgd | edBd e3 f | gedB GABG | dBAG E2 BA | GEDE GABG | 
 A2 GA Bdef | gedB GABG | AGEF G2 BA |]  