Banjo of the sleepless night

This banjo allows a creature with a charisma of 18 and more to be able to cast all of his spells with the instrument. The need for mouvement and materials is revoke. 

If the spells are charms, the creatures affected must roll a wisdom save  if the spells fails to see if they realized were it came from. 

Notes: Must practice the instrument 5 times for an hour if the caster is not bard, Instrument, Bard