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You seem to be from Russia. Tell us about the music scene there.
I don't really think that's a rehearsal, it sounds like a studio recording.
Not a lot to say about the bass playing. You're all playing to a sequencer and everyone is locked into it, so that's good. The parts are all extremely repetitive with no variation like most pop songs these day
You have your bass strung like a guitar, usually the end of the string goes into the hole in the tuning peg. Often the string has to be cut first so that there are not too many windings around the peg.