[he can guess this is an expression, though he's never used it.] Have you attempted meditation? [he asks, worry in his voice still at the thought of a mind never at peace.] If it does not work, I am happy to play when you feel it is needed.

[the description of the guitar is familiar and the image, well, it helps.] We have many instruments similar to this but not a guitar. Is making the room shake the purpose of playing it in such a manner? [sounds dangerous to those around you at the time!]