Item: Rhythm Drones, Construct assistants for Bards that can each store three song-spells, providing +2 on the proficiency bonus. If multiple drones know the same song-spell, their bonuses stack, up to seven of them. Alternatively, their song-spells can be any of the Bard cantrip-spells, which they are able to play on their own without a Bard taking the lead. The songs may be changed out each morning by a trained Bard, just as a magic-user would learn their spells for the day.