1. The architecture, who designed our home died yesterday.
2. We should try to design the interior of your house.
3. He didn't give me correct directions regarding my tax payments.
4. He didn't give me correct directions to go to his house.
5. I was asking for guidelines in order to solve the problem with the tax payments.
6. The word песня refers to both instrumental and vocal pieces in Russia. E.g. I cannot play this piece / song on the piano.

Also a question regarding the correct English strucutre of , and :.
If I want to say:
My question is the following, what kind of tax do you pay ...
My question is the following, according to the Russian law ...

or is it better to use:
My question is the following: what kind of tax do you pay ...
My question is the following: according to the Russian law ...