These men are part of the group Cubanos Acapella and as you’ve figured out after the band’s name, they sing without instruments. This 6 men manage to create a great job using only their voices.
This guys manage to interpret the song “Hotel California” of the famous band The Eagles, using the oldest instruments in the world: their voices.
It’s amazing how the singer’s voice combines with the sounds produced by the other members of the band.
On the background of the song can be heard a guitar and no matter how hard it would be to believe, this is the work of one of the band guys that manages to reproduce this tool and give an impressive solo.

https://www.youtube.com/watch?v=fW1dUnBhwL8