Staff of Accompaniment

Staff, common (requires attunement by a bard)   This hollow, laquered wooden staff has strings running along one side, holes akin to a wind instrument running along another, and a reed-bearing mouthpiece set in its top. As an action, you can activate the staff by plucking a string or blowing into it. The staff will then stand upright on its own and play accompaniment to any music you make, giving you advantage on ability checks you make to perform your music. The staff stops playing when you do.