This magical lyre's strings reverberate with enchantment magic when you tell lies, allowing you to deceive other creatures more easily. You have advantage on Charisma (Deception) checks you make when you spend at least 1 minute attempting to convince a creature of a lie. In addition, if you cast the vicious mockery cantrip while holding the lyre, the spell save DC is increased by 1. You are proficient with this lyre while you're attuned to it.
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.