is it possible to have a beautiful agreeable good sound to dance or to rhythm the night while using a cheap $70 guitar (the classical guitar). Is the instruments responsible for it or it depends just of the musician ? Any minds ? thanks a lot in advance
There is a reason that instruments including cheap ones are showcased by expert players. Famously, Paganini, getting tired of having his prowess attributed to his "magic" violin, one evening after a concert earning thunderous applause broke his instrument in pieces to a flabbergasted audience. It had been a cheap instrument he got for that occasion.
A cheap instrument will make its player work a lot more for getting an agreeable sound out, but it's not beyond possibility.
Now $70 is really asking for it. For a used instrument, you might have a chance. For something costing $70 when new, this will be tricky. Your best bet is when it is brand new and has not yet have had opportunity to warp its machine-milled neck: once that has happened, the instrument is no longer playable sensibly even by professionals.
Also it helps if you don't have to fill a concert hall with your sound and put on reasonable strings.
Generally speaking, the only limiting factors for a magic performance on a dirt cheap instrument are the skills of the guitarist and whether the guitar's intonation is correct (whether it can be played in tune).