Generate harmonious tunes by incorporating the specified letter-based framework and the presented motif.
X:1
L:1/4
M:6/4
K:G
['_B c2 B']  
X:1
L:1/4
M:6/4
K:G
 G G G | A2 A _B G2 | =F2 F _B2 c | d2 c d2 c/_B/ | A3 d d d | _B c2 B A G | =F2 z G2 A | 
 _B c2 B A2 | G6 | z3 |]  