You can use an action to play this lyre and cast one of the following spells from it: animal friendship, charm person, enthrall, suggestion. If the spell requires a saving throw, the spell save DC is 13.
Once the instrument has been used to cast a spell, it can't be used to cast that spell again until the next dawn.
If you have proficiency with a given musical instrument, you can add your proficiency bonus to any ability checks you make to play music with the instrument. A bard can use a musical instrument as a spellcasting focus. Each type of musical instrument requires a separate proficiency.