What is the difference of shin-bushi,kyu-bushi and shin-kyu bushi?

Recently, i saw anime named mashiro no oto, which is one and only anime deeply related with tsugaru shamisen. after i watch whole episodes, i downloaded whole ost and saw many versions of jongara bushi and it made me wondered what is actual differences of those shin-bushi, kyu-bushi and shin-kyu bushi

So i googled it, but sadly i didn’t got any helpful informations.

it would be glad if someone tell me the differences.