SQL and fetchone

[buran]

if I understand the real meaning of your answer, you say without the print everything is running nicely, don't you?

yes, that's what I think

but I ran my code without it and I obtained the same result, I added it to know what is the matter.

I guess that now the error comes at different place, i.e. when you hit a song without genre.
It's a bit tricky to debug without actual input file, but I am glad it works