Generate harmonious tunes by incorporating the specified letter-based framework and the presented motif.
X:1
L:1/4
M:4/4
K:Cmix
['B A G C']  
X:1
L:1/4
M:4/4
K:Cmix
 C/ | F E/E/ F G/A/ | B A G C | G3/2 G/ G A | =B G c2 |"^*" (c/c/ c) F c | B A G C | 
 E/4 E3/4 F/ G E | D/ D3/2 C3/2 |]  